77478980 has 24 divisors (see below), whose sum is σ = 163899288. Its totient is φ = 30764288.

The previous prime is 77478949. The next prime is 77478997. The reversal of 77478980 is 8987477.

It can be written as a sum of positive squares in 4 ways, for example, as 6885376 + 70593604 = 2624^2 + 8402^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11399 + ... + 16878.

It is an arithmetic number, because the mean of its divisors is an integer number (6829137).

Almost surely, 2^77478980 is an apocalyptic number.

It is an amenable number.

77478980 is an abundant number, since it is smaller than the sum of its proper divisors (86420308).

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

77478980 is a wasteful number, since it uses less digits than its factorization.

77478980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28423 (or 28421 counting only the distinct ones).

The product of its (nonzero) digits is 790272, while the sum is 50.

The square root of 77478980 is about 8802.2144940918. The cubic root of 77478980 is about 426.3123998853.

The spelling of 77478980 in words is "seventy-seven million, four hundred seventy-eight thousand, nine hundred eighty".