77280048 has 40 divisors (see below), whose sum is σ = 221823600. Its totient is φ = 25759872.

The previous prime is 77280037. The next prime is 77280053. The reversal of 77280048 is 84008277.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 77279994 and 77280021.

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, 89013 + ... + 89876.

It is an arithmetic number, because the mean of its divisors is an integer number (5545590).

Almost surely, 2^77280048 is an apocalyptic number.

It is an amenable number.

77280048 is an abundant number, since it is smaller than the sum of its proper divisors (144543552).

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

77280048 is a wasteful number, since it uses less digits than its factorization.

77280048 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178906 (or 178894 counting only the distinct ones).

The product of its (nonzero) digits is 25088, while the sum is 36.

The square root of 77280048 is about 8790.9071204285. The cubic root of 77280048 is about 425.9472261545.

The spelling of 77280048 in words is "seventy-seven million, two hundred eighty thousand, forty-eight".