90139896 has 192 divisors, whose sum is σ = 310003200. Its totient is φ = 22982400.

The previous prime is 90139879. The next prime is 90139897. The reversal of 90139896 is 69893109.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90139897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 393510 + ... + 393738.

It is an arithmetic number, because the mean of its divisors is an integer number (1614600).

Almost surely, 2^90139896 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 90139896, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (155001600).

90139896 is an abundant number, since it is smaller than the sum of its proper divisors (219863304).

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

90139896 is a wasteful number, since it uses less digits than its factorization.

90139896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330 (or 323 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 45.

The square root of 90139896 is about 9494.2032841097. The cubic root of 90139896 is about 448.3725509687.

The spelling of 90139896 in words is "ninety million, one hundred thirty-nine thousand, eight hundred ninety-six".