90691392 has 112 divisors (see below), whose sum is σ = 273295872. Its totient is φ = 26273280.

The previous prime is 90691373. The next prime is 90691453. The reversal of 90691392 is 29319609.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 90691392.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47643 + ... + 49509.

Almost surely, 2^90691392 is an apocalyptic number.

90691392 is a gapful number since it is divisible by the number (92) 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 90691392, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (136647936).

90691392 is an abundant number, since it is smaller than the sum of its proper divisors (182604480).

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

90691392 is a wasteful number, since it uses less digits than its factorization.

90691392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1916 (or 1906 counting only the distinct ones).

The product of its (nonzero) digits is 26244, while the sum is 39.

The square root of 90691392 is about 9523.2028225802. The cubic root of 90691392 is about 449.2851068607.

The spelling of 90691392 in words is "ninety million, six hundred ninety-one thousand, three hundred ninety-two".