78777480 has 32 divisors (see below), whose sum is σ = 236332800. Its totient is φ = 21007296.

The previous prime is 78777469. The next prime is 78777487. The reversal of 78777480 is 8477787.

It is not an unprimeable number, because it can be changed into a prime (78777487) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 328120 + ... + 328359.

It is an arithmetic number, because the mean of its divisors is an integer number (7385400).

Almost surely, 2^78777480 is an apocalyptic number.

It is an amenable number.

78777480 is an abundant number, since it is smaller than the sum of its proper divisors (157555320).

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

78777480 is a wasteful number, since it uses less digits than its factorization.

78777480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 656493 (or 656489 counting only the distinct ones).

The product of its (nonzero) digits is 614656, while the sum is 48.

The square root of 78777480 is about 8875.6678621949. The cubic root of 78777480 is about 428.6807955804.

The spelling of 78777480 in words is "seventy-eight million, seven hundred seventy-seven thousand, four hundred eighty".