28631432 has 16 divisors (see below), whose sum is σ = 53752140. Its totient is φ = 14297536.

The previous prime is 28631429. The next prime is 28631443. The reversal of 28631432 is 23413682.

It can be written as a sum of positive squares in 2 ways, for example, as 27520516 + 1110916 = 5246^2 + 1054^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28631395 and 28631404.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6338 + ... + 9870.

Almost surely, 2^28631432 is an apocalyptic number.

It is an amenable number.

28631432 is a deficient number, since it is larger than the sum of its proper divisors (25120708).

28631432 is a wasteful number, since it uses less digits than its factorization.

28631432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4552 (or 4548 counting only the distinct ones).

The product of its digits is 6912, while the sum is 29.

The square root of 28631432 is about 5350.8347012405. The cubic root of 28631432 is about 305.9245688166.

It can be divided in two parts, 2863 and 1432, that multiplied together give a triangular number (4099816 = T₂₈₆₃).

The spelling of 28631432 in words is "twenty-eight million, six hundred thirty-one thousand, four hundred thirty-two".