28636590 has 32 divisors (see below), whose sum is σ = 69019776. Its totient is φ = 7604000.

The previous prime is 28636571. The next prime is 28636603. The reversal of 28636590 is 9563682.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5629 + ... + 9431.

It is an arithmetic number, because the mean of its divisors is an integer number (2156868).

Almost surely, 2^28636590 is an apocalyptic number.

28636590 is an abundant number, since it is smaller than the sum of its proper divisors (40383186).

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

28636590 is a wasteful number, since it uses less digits than its factorization.

28636590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4064.

The product of its (nonzero) digits is 77760, while the sum is 39.

The square root of 28636590 is about 5351.3166604117. The cubic root of 28636590 is about 305.9429386532.

It can be divided in two parts, 2863 and 6590, that added together give a triangular number (9453 = T₁₃₇).

The spelling of 28636590 in words is "twenty-eight million, six hundred thirty-six thousand, five hundred ninety".