72157055 has 8 divisors (see below), whose sum is σ = 87398352. Its totient is φ = 57185728.

The previous prime is 72157037. The next prime is 72157073. The reversal of 72157055 is 55075127.

It is an interprime number because it is at equal distance from previous prime (72157037) and next prime (72157073).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 72157055 - 2⁶ = 72156991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66902 + ... + 67971.

It is an arithmetic number, because the mean of its divisors is an integer number (10924794).

Almost surely, 2^72157055 is an apocalyptic number.

72157055 is a deficient number, since it is larger than the sum of its proper divisors (15241297).

72157055 is a wasteful number, since it uses less digits than its factorization.

72157055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134985.

The product of its (nonzero) digits is 12250, while the sum is 32.

The square root of 72157055 is about 8494.5308875770. The cubic root of 72157055 is about 416.3190334211.

The spelling of 72157055 in words is "seventy-two million, one hundred fifty-seven thousand, fifty-five".