90542500 has 30 divisors (see below), whose sum is σ = 198003806. Its totient is φ = 36216000.

The previous prime is 90542489. The next prime is 90542509. The reversal of 90542500 is 524509.

It can be written as a sum of positive squares in 5 ways, for example, as 54997056 + 35545444 = 7416^2 + 5962^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (90542509) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 15609 + ... + 20608.

Almost surely, 2^90542500 is an apocalyptic number.

It is an amenable number.

90542500 is an abundant number, since it is smaller than the sum of its proper divisors (107461306).

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

90542500 is a wasteful number, since it uses less digits than its factorization.

90542500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36241 (or 36224 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 90542500 is about 9515.3822834398. The cubic root of 90542500 is about 449.0391018901.

The spelling of 90542500 in words is "ninety million, five hundred forty-two thousand, five hundred".