72866403 has 24 divisors (see below), whose sum is σ = 113825088. Its totient is φ = 44742912.

The previous prime is 72866371. The next prime is 72866407. The reversal of 72866403 is 30466827.

72866403 is a `hidden beast` number, since 7 + 2 + 8 + 6 + 640 + 3 = 666.

It is not a de Polignac number, because 72866403 - 2⁵ = 72866371 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72866407) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2125 + ... + 12257.

It is an arithmetic number, because the mean of its divisors is an integer number (4742712).

Almost surely, 2^72866403 is an apocalyptic number.

72866403 is a deficient number, since it is larger than the sum of its proper divisors (40958685).

72866403 is a wasteful number, since it uses less digits than its factorization.

72866403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10203 (or 10200 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 36.

The square root of 72866403 is about 8536.1819919681. The cubic root of 72866403 is about 417.6788109007.

It can be divided in two parts, 7286 and 6403, that added together give a square (13689 = 117²).

The spelling of 72866403 in words is "seventy-two million, eight hundred sixty-six thousand, four hundred three".