72551403 has 16 divisors (see below), whose sum is σ = 107692960. Its totient is φ = 48273408.

The previous prime is 72551389. The next prime is 72551459. The reversal of 72551403 is 30415527.

It is a happy number.

72551403 is a `hidden beast` number, since 7 + 255 + 1 + 403 = 666.

It is not a de Polignac number, because 72551403 - 2⁵ = 72551371 is a prime.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72551603) 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, 13251 + ... + 17907.

It is an arithmetic number, because the mean of its divisors is an integer number (6730810).

Almost surely, 2^72551403 is an apocalyptic number.

72551403 is a deficient number, since it is larger than the sum of its proper divisors (35141557).

72551403 is a wasteful number, since it uses less digits than its factorization.

72551403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5243 (or 5237 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 27.

The square root of 72551403 is about 8517.7111362149. The cubic root of 72551403 is about 417.0760691411.

The spelling of 72551403 in words is "seventy-two million, five hundred fifty-one thousand, four hundred three".