76021780 has 24 divisors (see below), whose sum is σ = 160202952. Its totient is φ = 30302592.

The previous prime is 76021661. The next prime is 76021811. The reversal of 76021780 is 8712067.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 4145296 + 71876484 = 2036^2 + 8478^2 .

It is a super-2 number, since 2×76021780² = 11558622068736800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 627 + ... + 12346.

It is an arithmetic number, because the mean of its divisors is an integer number (6675123).

Almost surely, 2^76021780 is an apocalyptic number.

It is an amenable number.

76021780 is an abundant number, since it is smaller than the sum of its proper divisors (84181172).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

76021780 is a wasteful number, since it uses less digits than its factorization.

76021780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13275 (or 13273 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 31.

The square root of 76021780 is about 8719.0469662687. The cubic root of 76021780 is about 423.6228178229.

The spelling of 76021780 in words is "seventy-six million, twenty-one thousand, seven hundred eighty".