72555100 has 72 divisors (see below), whose sum is σ = 164989440. Its totient is φ = 27659520.

The previous prime is 72555083. The next prime is 72555107. The reversal of 72555100 is 155527.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72555107) 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, 368202 + ... + 368398.

It is an arithmetic number, because the mean of its divisors is an integer number (2291520).

Almost surely, 2^72555100 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 72555100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82494720).

72555100 is an abundant number, since it is smaller than the sum of its proper divisors (92434340).

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

72555100 is a wasteful number, since it uses less digits than its factorization.

72555100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 367 (or 360 counting only the distinct ones).

The product of its (nonzero) digits is 1750, while the sum is 25.

The square root of 72555100 is about 8517.9281518454. The cubic root of 72555100 is about 417.0831533323.

The spelling of 72555100 in words is "seventy-two million, five hundred fifty-five thousand, one hundred".