77947420 has 24 divisors (see below), whose sum is σ = 164433024. Its totient is φ = 31037376.

The previous prime is 77947403. The next prime is 77947427. The reversal of 77947420 is 2474977.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77947427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4279 + ... + 13198.

It is an arithmetic number, because the mean of its divisors is an integer number (6851376).

Almost surely, 2^77947420 is an apocalyptic number.

It is an amenable number.

77947420 is an abundant number, since it is smaller than the sum of its proper divisors (86485604).

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

77947420 is a wasteful number, since it uses less digits than its factorization.

77947420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17709 (or 17707 counting only the distinct ones).

The product of its (nonzero) digits is 98784, while the sum is 40.

The square root of 77947420 is about 8828.7836081762. The cubic root of 77947420 is about 427.1698395831.

The spelling of 77947420 in words is "seventy-seven million, nine hundred forty-seven thousand, four hundred twenty".