72770605 has 4 divisors (see below), whose sum is σ = 87324732. Its totient is φ = 58216480.

The previous prime is 72770603. The next prime is 72770611. The reversal of 72770605 is 50607727.

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 19027044 + 53743561 = 4362^2 + 7331^2 .

It is not a de Polignac number, because 72770605 - 2¹ = 72770603 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 (72770603) 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, 7277056 + ... + 7277065.

It is an arithmetic number, because the mean of its divisors is an integer number (21831183).

Almost surely, 2^72770605 is an apocalyptic number.

It is an amenable number.

72770605 is a deficient number, since it is larger than the sum of its proper divisors (14554127).

72770605 is a wasteful number, since it uses less digits than its factorization.

72770605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14554126.

The product of its (nonzero) digits is 20580, while the sum is 34.

The square root of 72770605 is about 8530.5688555922. The cubic root of 72770605 is about 417.4956888173.

The spelling of 72770605 in words is "seventy-two million, seven hundred seventy thousand, six hundred five".