77478648 has 64 divisors (see below), whose sum is σ = 209986560. Its totient is φ = 23680896.

The previous prime is 77478631. The next prime is 77478649. The reversal of 77478648 is 84687477.

It is a self number, because there is not a number n which added to its sum of digits gives 77478648.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77478649) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51361 + ... + 52847.

It is an arithmetic number, because the mean of its divisors is an integer number (3281040).

Almost surely, 2^77478648 is an apocalyptic number.

77478648 is a gapful number since it is divisible by the number (78) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 77478648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104993280).

77478648 is an abundant number, since it is smaller than the sum of its proper divisors (132507912).

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

77478648 is a wasteful number, since it uses less digits than its factorization.

77478648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1676 (or 1672 counting only the distinct ones).

The product of its digits is 2107392, while the sum is 51.

The square root of 77478648 is about 8802.1956351810. The cubic root of 77478648 is about 426.3117909635.

The spelling of 77478648 in words is "seventy-seven million, four hundred seventy-eight thousand, six hundred forty-eight".