90621250 has 20 divisors (see below), whose sum is σ = 169862814. Its totient is φ = 36248000.

The previous prime is 90621239. The next prime is 90621257. The reversal of 90621250 is 5212609.

It can be written as a sum of positive squares in 5 ways, for example, as 47961 + 90573289 = 219^2 + 9517^2 .

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 (90621257) 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, 34999 + ... + 37498.

Almost surely, 2^90621250 is an apocalyptic number.

90621250 is a deficient number, since it is larger than the sum of its proper divisors (79241564).

90621250 is an equidigital number, since it uses as much as digits as its factorization.

90621250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72519 (or 72504 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 90621250 is about 9519.5194206430. The cubic root of 90621250 is about 449.1692491769.

Adding to 90621250 its reverse (5212609), we get a palindrome (95833859).

The spelling of 90621250 in words is "ninety million, six hundred twenty-one thousand, two hundred fifty".