28632639 has 16 divisors (see below), whose sum is σ = 45927680. Its totient is φ = 15500160.

The previous prime is 28632587. The next prime is 28632647. The reversal of 28632639 is 93623682.

It is not a de Polignac number, because 28632639 - 2¹⁷ = 28501567 is a prime.

It is a super-2 number, since 2×28632639² = 1639656032208642, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28632597 and 28632606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28632689) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35482 + ... + 36279.

It is an arithmetic number, because the mean of its divisors is an integer number (2870480).

Almost surely, 2^28632639 is an apocalyptic number.

28632639 is a deficient number, since it is larger than the sum of its proper divisors (17295041).

28632639 is a wasteful number, since it uses less digits than its factorization.

28632639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71790.

The product of its digits is 93312, while the sum is 39.

The square root of 28632639 is about 5350.9474861934. The cubic root of 28632639 is about 305.9288676558.

The spelling of 28632639 in words is "twenty-eight million, six hundred thirty-two thousand, six hundred thirty-nine".