72120055 has 16 divisors (see below), whose sum is σ = 99273024. Its totient is φ = 49271040.

The previous prime is 72120031. The next prime is 72120079. The reversal of 72120055 is 55002127.

It is an interprime number because it is at equal distance from previous prime (72120031) and next prime (72120079).

It is not a de Polignac number, because 72120055 - 2¹⁵ = 72087287 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 15 ways as a sum of consecutive naturals, for example, 6169 + ... + 13501.

It is an arithmetic number, because the mean of its divisors is an integer number (6204564).

Almost surely, 2^72120055 is an apocalyptic number.

72120055 is a deficient number, since it is larger than the sum of its proper divisors (27152969).

72120055 is a wasteful number, since it uses less digits than its factorization.

72120055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7626.

The product of its (nonzero) digits is 700, while the sum is 22.

The square root of 72120055 is about 8492.3527364329. The cubic root of 72120055 is about 416.2478625663.

It can be divided in two parts, 7212005 and 5, that multiplied together give a square (36060025 = 6005²).

The spelling of 72120055 in words is "seventy-two million, one hundred twenty thousand, fifty-five".