28523764 has 6 divisors (see below), whose sum is σ = 49916594. Its totient is φ = 14261880.

The previous prime is 28523743. The next prime is 28523771. The reversal of 28523764 is 46732582.

It can be written as a sum of positive squares in only one way, i.e., 20160100 + 8363664 = 4490^2 + 2892^2 .

It is a super-2 number, since 2×28523764² = 1627210225455392, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3565467 + ... + 3565474.

Almost surely, 2^28523764 is an apocalyptic number.

It is an amenable number.

28523764 is a deficient number, since it is larger than the sum of its proper divisors (21392830).

28523764 is a wasteful number, since it uses less digits than its factorization.

28523764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7130945 (or 7130943 counting only the distinct ones).

The product of its digits is 80640, while the sum is 37.

The square root of 28523764 is about 5340.7643647703. The cubic root of 28523764 is about 305.5406124605.

The spelling of 28523764 in words is "twenty-eight million, five hundred twenty-three thousand, seven hundred sixty-four".