691422239040 has 896 divisors, whose sum is σ = 2625536471040. Its totient is φ = 152521408512.

The previous prime is 691422238963. The next prime is 691422239047. The reversal of 691422239040 is 40932224196.

It is a junction number, because it is equal to n+sod(n) for n = 691422238983 and 691422239001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (691422239047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 529014067 + ... + 529015373.

It is an arithmetic number, because the mean of its divisors is an integer number (2930286240).

Almost surely, 2^691422239040 is an apocalyptic number.

691422239040 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 691422239040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1312768235520).

691422239040 is an abundant number, since it is smaller than the sum of its proper divisors (1934114232000).

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

691422239040 is a wasteful number, since it uses less digits than its factorization.

691422239040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1479 (or 1469 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 42.

The spelling of 691422239040 in words is "six hundred ninety-one billion, four hundred twenty-two million, two hundred thirty-nine thousand, forty".