72961757 has 4 divisors (see below), whose sum is σ = 79594656. Its totient is φ = 66328860.

The previous prime is 72961753. The next prime is 72961769. The reversal of 72961757 is 75716927.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 72961757 - 2² = 72961753 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 (72961753) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3316433 + ... + 3316454.

It is an arithmetic number, because the mean of its divisors is an integer number (19898664).

Almost surely, 2^72961757 is an apocalyptic number.

It is an amenable number.

72961757 is a deficient number, since it is larger than the sum of its proper divisors (6632899).

72961757 is a wasteful number, since it uses less digits than its factorization.

72961757 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6632898.

The product of its digits is 185220, while the sum is 44.

The square root of 72961757 is about 8541.7654498353. The cubic root of 72961757 is about 417.8609249406.

The spelling of 72961757 in words is "seventy-two million, nine hundred sixty-one thousand, seven hundred fifty-seven".