31220769636 has 135 divisors (see below), whose sum is σ = 92220328473. Its totient is φ = 8905377600.

The previous prime is 31220769623. The next prime is 31220769649. The reversal of 31220769636 is 63696702213.

The square root of 31220769636 is 176694.

It is a perfect power (a square), and thus also a powerful number.

31220769636 is a `hidden beast` number, since 3 + 1 + 2 + 2 + 0 + 7 + 6 + 9 + 636 = 666.

It is an interprime number because it is at equal distance from previous prime (31220769623) and next prime (31220769649).

It can be written as a sum of positive squares in only one way, i.e., 26242056036 + 4978713600 = 161994^2 + 70560^2 .

It is a junction number, because it is equal to n+sod(n) for n = 31220769591 and 31220769600.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 51947736 + ... + 51948336.

Almost surely, 2^31220769636 is an apocalyptic number.

31220769636 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

31220769636 is the 176694-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31220769636

31220769636 is an abundant number, since it is smaller than the sum of its proper divisors (60999558837).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31220769636 is an frugal number, since it uses more digits than its factorization.

31220769636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1240 (or 613 counting only the distinct ones).

The product of its (nonzero) digits is 489888, while the sum is 45.

The spelling of 31220769636 in words is "thirty-one billion, two hundred twenty million, seven hundred sixty-nine thousand, six hundred thirty-six".