28637628 has 12 divisors (see below), whose sum is σ = 66821160. Its totient is φ = 9545872.

The previous prime is 28637627. The next prime is 28637629. The reversal of 28637628 is 82673682.

It is an interprime number because it is at equal distance from previous prime (28637627) and next prime (28637629).

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×28637628² = 1640227474932768, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28637628.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28637627) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1193223 + ... + 1193246.

It is an arithmetic number, because the mean of its divisors is an integer number (5568430).

Almost surely, 2^28637628 is an apocalyptic number.

It is an amenable number.

28637628 is an abundant number, since it is smaller than the sum of its proper divisors (38183532).

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

28637628 is a wasteful number, since it uses less digits than its factorization.

28637628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2386476 (or 2386474 counting only the distinct ones).

The product of its digits is 193536, while the sum is 42.

The square root of 28637628 is about 5351.4136450101. The cubic root of 28637628 is about 305.9466351470.

The spelling of 28637628 in words is "twenty-eight million, six hundred thirty-seven thousand, six hundred twenty-eight".