625077721 has 8 divisors (see below), whose sum is σ = 630157320. Its totient is φ = 620019072.

The previous prime is 625077701. The next prime is 625077763. The reversal of 625077721 is 127770526.

It can be written as a sum of positive squares in 4 ways, for example, as 36481600 + 588596121 = 6040^2 + 24261^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 625077721 - 2⁹ = 625077209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (625077701) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57691 + ... + 67663.

It is an arithmetic number, because the mean of its divisors is an integer number (78769665).

Almost surely, 2^625077721 is an apocalyptic number.

It is an amenable number.

625077721 is a deficient number, since it is larger than the sum of its proper divisors (5079599).

625077721 is a wasteful number, since it uses less digits than its factorization.

625077721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10475.

The product of its (nonzero) digits is 41160, while the sum is 37.

The square root of 625077721 is about 25001.5543716786. The cubic root of 625077721 is about 855.0234121469.

The spelling of 625077721 in words is "six hundred twenty-five million, seventy-seven thousand, seven hundred twenty-one".