76221409 has 6 divisors (see below), whose sum is σ = 83780690. Its totient is φ = 69292080.

The previous prime is 76221403. The next prime is 76221427. The reversal of 76221409 is 90412267.

It can be written as a sum of positive squares in only one way, i.e., 72301009 + 3920400 = 8503^2 + 1980^2 .

It is not a de Polignac number, because 76221409 - 2³ = 76221401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (76221401) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 314844 + ... + 315085.

Almost surely, 2^76221409 is an apocalyptic number.

It is an amenable number.

76221409 is a deficient number, since it is larger than the sum of its proper divisors (7559281).

76221409 is a wasteful number, since it uses less digits than its factorization.

76221409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 629951 (or 629940 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 76221409 is about 8730.4873288952. The cubic root of 76221409 is about 423.9932971083.

The spelling of 76221409 in words is "seventy-six million, two hundred twenty-one thousand, four hundred nine".