772375721 has 16 divisors (see below), whose sum is σ = 841104768. Its totient is φ = 705024000.

The previous prime is 772375693. The next prime is 772375781. The reversal of 772375721 is 127573277.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 772375721 - 2⁶ = 772375657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (772375781) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 503726 + ... + 505256.

It is an arithmetic number, because the mean of its divisors is an integer number (52569048).

Almost surely, 2^772375721 is an apocalyptic number.

It is an amenable number.

772375721 is a deficient number, since it is larger than the sum of its proper divisors (68729047).

772375721 is a wasteful number, since it uses less digits than its factorization.

772375721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1952.

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

The square root of 772375721 is about 27791.6484037921. The cubic root of 772375721 is about 917.5073201632.

The spelling of 772375721 in words is "seven hundred seventy-two million, three hundred seventy-five thousand, seven hundred twenty-one".