90156399288 has 128 divisors (see below), whose sum is σ = 233322223680. Its totient is φ = 29011804160.

The previous prime is 90156399283. The next prime is 90156399313. The reversal of 90156399288 is 88299365109.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90156399283) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 39662920 + ... + 39665192.

Almost surely, 2^90156399288 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 90156399288, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (116661111840).

90156399288 is an abundant number, since it is smaller than the sum of its proper divisors (143165824392).

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

90156399288 is a wasteful number, since it uses less digits than its factorization.

90156399288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2729 (or 2725 counting only the distinct ones).

The product of its (nonzero) digits is 8398080, while the sum is 60.

The spelling of 90156399288 in words is "ninety billion, one hundred fifty-six million, three hundred ninety-nine thousand, two hundred eighty-eight".