76721825 has 6 divisors (see below), whose sum is σ = 95135094. Its totient is φ = 61377440.

The previous prime is 76721809. The next prime is 76721837. The reversal of 76721825 is 52812767.

It can be written as a sum of positive squares in 3 ways, for example, as 54289 + 76667536 = 233^2 + 8756^2 .

It is not a de Polignac number, because 76721825 - 2⁴ = 76721809 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1534412 + ... + 1534461.

It is an arithmetic number, because the mean of its divisors is an integer number (15855849).

Almost surely, 2^76721825 is an apocalyptic number.

It is an amenable number.

76721825 is a deficient number, since it is larger than the sum of its proper divisors (18413269).

76721825 is a wasteful number, since it uses less digits than its factorization.

76721825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3068883 (or 3068878 counting only the distinct ones).

The product of its digits is 47040, while the sum is 38.

The square root of 76721825 is about 8759.0995541779. The cubic root of 76721825 is about 424.9191541722.

The spelling of 76721825 in words is "seventy-six million, seven hundred twenty-one thousand, eight hundred twenty-five".