15997790088 has 576 divisors, whose sum is σ = 56290464000. Its totient is φ = 4194747648.

The previous prime is 15997790059. The next prime is 15997790089. The reversal of 15997790088 is 88009779951.

It is a super-2 number, since 2×15997790088² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15997790089) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 202503633 + ... + 202503711.

It is an arithmetic number, because the mean of its divisors is an integer number (97726500).

Almost surely, 2^15997790088 is an apocalyptic number.

15997790088 is a gapful number since it is divisible by the number (18) 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 15997790088, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28145232000).

15997790088 is an abundant number, since it is smaller than the sum of its proper divisors (40292673912).

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

15997790088 is a wasteful number, since it uses less digits than its factorization.

15997790088 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199 (or 163 counting only the distinct ones).

The product of its (nonzero) digits is 11430720, while the sum is 63.

The spelling of 15997790088 in words is "fifteen billion, nine hundred ninety-seven million, seven hundred ninety thousand, eighty-eight".