28501690 has 64 divisors (see below), whose sum is σ = 63638784. Its totient is φ = 8967168.

The previous prime is 28501667. The next prime is 28501709. The reversal of 28501690 is 9610582.

It is a super-2 number, since 2×28501690² = 1624692665712200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 50892 + ... + 51448.

It is an arithmetic number, because the mean of its divisors is an integer number (994356).

Almost surely, 2^28501690 is an apocalyptic number.

28501690 is an abundant number, since it is smaller than the sum of its proper divisors (35137094).

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

28501690 is a wasteful number, since it uses less digits than its factorization.

28501690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 631.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 28501690 is about 5338.6974066714. The cubic root of 28501690 is about 305.4617747583.

The spelling of 28501690 in words is "twenty-eight million, five hundred one thousand, six hundred ninety".