28413639 has 32 divisors (see below), whose sum is σ = 44083200. Its totient is φ = 18066240.

The previous prime is 28413629. The next prime is 28413641. The reversal of 28413639 is 93631482.

28413639 is a `hidden beast` number, since 2 + 8 + 4 + 13 + 639 = 666.

It is not a de Polignac number, because 28413639 - 2⁸ = 28413383 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28413629) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 69267 + ... + 69675.

It is an arithmetic number, because the mean of its divisors is an integer number (1377600).

Almost surely, 2^28413639 is an apocalyptic number.

28413639 is a deficient number, since it is larger than the sum of its proper divisors (15669561).

28413639 is a wasteful number, since it uses less digits than its factorization.

28413639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 532 (or 526 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 28413639 is about 5330.4445405613. Note that the first 3 decimals coincide. The cubic root of 28413639 is about 305.1468933200.

The spelling of 28413639 in words is "twenty-eight million, four hundred thirteen thousand, six hundred thirty-nine".