78720449280 has 144 divisors (see below), whose sum is σ = 274269348864. Its totient is φ = 19083735040.

The previous prime is 78720449273. The next prime is 78720449387. The reversal of 78720449280 is 8294402787.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 889584 + ... + 974063.

It is an arithmetic number, because the mean of its divisors is an integer number (1904648256).

Almost surely, 2^78720449280 is an apocalyptic number.

It is an amenable number.

78720449280 is an abundant number, since it is smaller than the sum of its proper divisors (195548899584).

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

78720449280 is a wasteful number, since it uses less digits than its factorization.

78720449280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1863682 (or 1863668 counting only the distinct ones).

The product of its (nonzero) digits is 1806336, while the sum is 51.

The spelling of 78720449280 in words is "seventy-eight billion, seven hundred twenty million, four hundred forty-nine thousand, two hundred eighty".