77047980 has 48 divisors (see below), whose sum is σ = 216384000. Its totient is φ = 20484288.

The previous prime is 77047969. The next prime is 77047991. The reversal of 77047980 is 8974077.

It is an interprime number because it is at equal distance from previous prime (77047969) and next prime (77047991).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20271 + ... + 23769.

It is an arithmetic number, because the mean of its divisors is an integer number (4508000).

Almost surely, 2^77047980 is an apocalyptic number.

It is an amenable number.

77047980 is an abundant number, since it is smaller than the sum of its proper divisors (139336020).

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

77047980 is a wasteful number, since it uses less digits than its factorization.

77047980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3878 (or 3876 counting only the distinct ones).

The product of its (nonzero) digits is 98784, while the sum is 42.

The square root of 77047980 is about 8777.6978758670. The cubic root of 77047980 is about 425.5204328026.

The spelling of 77047980 in words is "seventy-seven million, forty-seven thousand, nine hundred eighty".