72455121 has 16 divisors (see below), whose sum is σ = 107990400. Its totient is φ = 48011184.

The previous prime is 72455111. The next prime is 72455147. The reversal of 72455121 is 12155427.

It is not a de Polignac number, because 72455121 - 2⁶ = 72455057 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (72455111) 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, 3526 + ... + 12543.

It is an arithmetic number, because the mean of its divisors is an integer number (6749400).

Almost surely, 2^72455121 is an apocalyptic number.

It is an amenable number.

72455121 is a deficient number, since it is larger than the sum of its proper divisors (35535279).

72455121 is a wasteful number, since it uses less digits than its factorization.

72455121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16245 (or 16239 counting only the distinct ones).

The product of its digits is 2800, while the sum is 27.

The square root of 72455121 is about 8512.0573893742. The cubic root of 72455121 is about 416.8914887680.

The spelling of 72455121 in words is "seventy-two million, four hundred fifty-five thousand, one hundred twenty-one".