90251590 has 32 divisors (see below), whose sum is σ = 190856736. Its totient is φ = 30293760.

The previous prime is 90251573. The next prime is 90251593. The reversal of 90251590 is 9515209.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90251593) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30127 + ... + 32986.

It is an arithmetic number, because the mean of its divisors is an integer number (5964273).

Almost surely, 2^90251590 is an apocalyptic number.

90251590 is an abundant number, since it is smaller than the sum of its proper divisors (100605146).

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

90251590 is a wasteful number, since it uses less digits than its factorization.

90251590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63144.

The product of its (nonzero) digits is 4050, while the sum is 31.

The square root of 90251590 is about 9500.0836838419. The cubic root of 90251590 is about 448.5576700814.

Adding to 90251590 its reverse (9515209), we get a palindrome (99766799).

The spelling of 90251590 in words is "ninety million, two hundred fifty-one thousand, five hundred ninety".