72553157 has 4 divisors (see below), whose sum is σ = 75055020. Its totient is φ = 70051296.

The previous prime is 72553147. The next prime is 72553163. The reversal of 72553157 is 75135527.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75135527 = 3313 ⋅22679.

It can be written as a sum of positive squares in 2 ways, for example, as 24542116 + 48011041 = 4954^2 + 6929^2 .

It is a cyclic number.

It is not a de Polignac number, because 72553157 - 2⁴ = 72553141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72553147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1250888 + ... + 1250945.

It is an arithmetic number, because the mean of its divisors is an integer number (18763755).

Almost surely, 2^72553157 is an apocalyptic number.

It is an amenable number.

72553157 is a deficient number, since it is larger than the sum of its proper divisors (2501863).

72553157 is a wasteful number, since it uses less digits than its factorization.

72553157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2501862.

The product of its digits is 36750, while the sum is 35.

The square root of 72553157 is about 8517.8140975253. The cubic root of 72553157 is about 417.0794301858.

The spelling of 72553157 in words is "seventy-two million, five hundred fifty-three thousand, one hundred fifty-seven".