72770657 has 4 divisors (see below), whose sum is σ = 75280020. Its totient is φ = 70261296.

The previous prime is 72770651. The next prime is 72770699. The reversal of 72770657 is 75607727.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 41589601 + 31181056 = 6449^2 + 5584^2 .

It is a cyclic number.

It is not a de Polignac number, because 72770657 - 2⁴ = 72770641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72770651) 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, 1254638 + ... + 1254695.

It is an arithmetic number, because the mean of its divisors is an integer number (18820005).

Almost surely, 2^72770657 is an apocalyptic number.

It is an amenable number.

72770657 is a deficient number, since it is larger than the sum of its proper divisors (2509363).

72770657 is a wasteful number, since it uses less digits than its factorization.

72770657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2509362.

The product of its (nonzero) digits is 144060, while the sum is 41.

The square root of 72770657 is about 8530.5719034541. The cubic root of 72770657 is about 417.4957882611.

The spelling of 72770657 in words is "seventy-two million, seven hundred seventy thousand, six hundred fifty-seven".