28628537 has 16 divisors (see below), whose sum is σ = 34981632. Its totient is φ = 22894080.

The previous prime is 28628519. The next prime is 28628591. The reversal of 28628537 is 73582682.

It is a cyclic number.

It is not a de Polignac number, because 28628537 - 2⁶ = 28628473 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a junction number, because it is equal to n+sod(n) for n = 28628494 and 28628503.

It is not an unprimeable number, because it can be changed into a prime (28628837) 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, 4433 + ... + 8769.

It is an arithmetic number, because the mean of its divisors is an integer number (2186352).

Almost surely, 2^28628537 is an apocalyptic number.

It is an amenable number.

28628537 is a deficient number, since it is larger than the sum of its proper divisors (6353095).

28628537 is a wasteful number, since it uses less digits than its factorization.

28628537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4408.

The product of its digits is 161280, while the sum is 41.

The square root of 28628537 is about 5350.5641758603. The cubic root of 28628537 is about 305.9142575210.

The spelling of 28628537 in words is "twenty-eight million, six hundred twenty-eight thousand, five hundred thirty-seven".