28639952 has 20 divisors (see below), whose sum is σ = 60534816. Its totient is φ = 13018080.

The previous prime is 28639931. The next prime is 28639969. The reversal of 28639952 is 25993682.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81188 + ... + 81539.

Almost surely, 2^28639952 is an apocalyptic number.

28639952 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

28639952 is an abundant number, since it is smaller than the sum of its proper divisors (31894864).

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

28639952 is a wasteful number, since it uses less digits than its factorization.

28639952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162746 (or 162740 counting only the distinct ones).

The product of its digits is 233280, while the sum is 44.

The square root of 28639952 is about 5351.6307794914. The cubic root of 28639952 is about 305.9549109807.

The spelling of 28639952 in words is "twenty-eight million, six hundred thirty-nine thousand, nine hundred fifty-two".