31699034820 has 144 divisors (see below), whose sum is σ = 97002360000. Its totient is φ = 8378793216.

The previous prime is 31699034813. The next prime is 31699034821. The reversal of 31699034820 is 2843099613.

It is a happy number.

31699034820 is a `hidden beast` number, since 3 + 169 + 9 + 0 + 3 + 482 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (31699034821) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 11243371 + ... + 11246189.

It is an arithmetic number, because the mean of its divisors is an integer number (673627500).

Almost surely, 2^31699034820 is an apocalyptic number.

31699034820 is a gapful number since it is divisible by the number (30) 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 31699034820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48501180000).

31699034820 is an abundant number, since it is smaller than the sum of its proper divisors (65303325180).

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

31699034820 is a wasteful number, since it uses less digits than its factorization.

31699034820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3362 (or 3357 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 45.

The spelling of 31699034820 in words is "thirty-one billion, six hundred ninety-nine million, thirty-four thousand, eight hundred twenty".