76556421 has 12 divisors (see below), whose sum is σ = 114677472. Its totient is φ = 51037452.

The previous prime is 76556413. The next prime is 76556437. The reversal of 76556421 is 12465567.

It is a happy number.

76556421 is a `hidden beast` number, since 7 + 6 + 5 + 5 + 642 + 1 = 666.

It is not a de Polignac number, because 76556421 - 2³ = 76556413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (76556021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 157281 + ... + 157766.

It is an arithmetic number, because the mean of its divisors is an integer number (9556456).

Almost surely, 2^76556421 is an apocalyptic number.

It is an amenable number.

76556421 is a deficient number, since it is larger than the sum of its proper divisors (38121051).

76556421 is an equidigital number, since it uses as much as digits as its factorization.

76556421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315062 (or 315050 counting only the distinct ones).

The product of its digits is 50400, while the sum is 36.

The square root of 76556421 is about 8749.6526216759. The cubic root of 76556421 is about 424.6135744752.

The spelling of 76556421 in words is "seventy-six million, five hundred fifty-six thousand, four hundred twenty-one".