28501605 has 64 divisors (see below), whose sum is σ = 58579200. Its totient is φ = 12994560.

The previous prime is 28501597. The next prime is 28501621. The reversal of 28501605 is 50610582.

28501605 is a `hidden beast` number, since 2 + 8 + 50 + 1 + 605 = 666.

It is not a de Polignac number, because 28501605 - 2³ = 28501597 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 24681 + ... + 25809.

It is an arithmetic number, because the mean of its divisors is an integer number (915300).

Almost surely, 2^28501605 is an apocalyptic number.

It is an amenable number.

28501605 is an abundant number, since it is smaller than the sum of its proper divisors (30077595).

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

28501605 is a wasteful number, since it uses less digits than its factorization.

28501605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1171 (or 1165 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The square root of 28501605 is about 5338.6894459221. The cubic root of 28501605 is about 305.4614711005.

The spelling of 28501605 in words is "twenty-eight million, five hundred one thousand, six hundred five".