72858555 has 128 divisors (see below), whose sum is σ = 166256640. Its totient is φ = 29393280.

The previous prime is 72858551. The next prime is 72858563. The reversal of 72858555 is 55585827.

It is not a de Polignac number, because 72858555 - 2² = 72858551 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 72858555.

It is not an unprimeable number, because it can be changed into a prime (72858551) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 446904 + ... + 447066.

It is an arithmetic number, because the mean of its divisors is an integer number (1298880).

Almost surely, 2^72858555 is an apocalyptic number.

72858555 is an abundant number, since it is smaller than the sum of its proper divisors (93398085).

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

72858555 is a wasteful number, since it uses less digits than its factorization.

72858555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238 (or 232 counting only the distinct ones).

The product of its digits is 560000, while the sum is 45.

The square root of 72858555 is about 8535.7222892969. The cubic root of 72858555 is about 417.6638151420.

The spelling of 72858555 in words is "seventy-two million, eight hundred fifty-eight thousand, five hundred fifty-five".