90631228 has 24 divisors (see below), whose sum is σ = 167215104. Its totient is φ = 42918000.

The previous prime is 90631223. The next prime is 90631231. The reversal of 90631228 is 82213609.

It is a super-3 number, since 3×90631228³ (a number of 25 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a self number, because there is not a number n which added to its sum of digits gives 90631228.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90631223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1948 + ... + 13603.

It is an arithmetic number, because the mean of its divisors is an integer number (6967296).

Almost surely, 2^90631228 is an apocalyptic number.

It is an amenable number.

90631228 is a deficient number, since it is larger than the sum of its proper divisors (76583876).

90631228 is a wasteful number, since it uses less digits than its factorization.

90631228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15633 (or 15631 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 90631228 is about 9520.0434872956. The cubic root of 90631228 is about 449.1857340753.

The spelling of 90631228 in words is "ninety million, six hundred thirty-one thousand, two hundred twenty-eight".