90690288 has 160 divisors (see below), whose sum is σ = 269982720. Its totient is φ = 26019840.

The previous prime is 90690277. The next prime is 90690323. The reversal of 90690288 is 88209609.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1018948 + ... + 1019036.

It is an arithmetic number, because the mean of its divisors is an integer number (1687392).

Almost surely, 2^90690288 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 90690288, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (134991360).

90690288 is an abundant number, since it is smaller than the sum of its proper divisors (179292432).

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

90690288 is a wasteful number, since it uses less digits than its factorization.

90690288 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207 (or 201 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 42.

The square root of 90690288 is about 9523.1448587113. The cubic root of 90690288 is about 449.2832837815.

The spelling of 90690288 in words is "ninety million, six hundred ninety thousand, two hundred eighty-eight".