72790757 has 4 divisors (see below), whose sum is σ = 78390060. Its totient is φ = 67191456.

The previous prime is 72790741. The next prime is 72790763. The reversal of 72790757 is 75709727.

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 17422276 + 55368481 = 4174^2 + 7441^2 .

It is a cyclic number.

It is not a de Polignac number, because 72790757 - 2⁴ = 72790741 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 (72790717) 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, 2799632 + ... + 2799657.

It is an arithmetic number, because the mean of its divisors is an integer number (19597515).

Almost surely, 2^72790757 is an apocalyptic number.

It is an amenable number.

72790757 is a deficient number, since it is larger than the sum of its proper divisors (5599303).

72790757 is a wasteful number, since it uses less digits than its factorization.

72790757 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5599302.

The product of its (nonzero) digits is 216090, while the sum is 44.

The square root of 72790757 is about 8531.7499377326. The cubic root of 72790757 is about 417.5342235920.

The spelling of 72790757 in words is "seventy-two million, seven hundred ninety thousand, seven hundred fifty-seven".