778980672 has 56 divisors (see below), whose sum is σ = 2290064000. Its totient is φ = 259659648.

The previous prime is 778980667. The next prime is 778980673. The reversal of 778980672 is 276089877.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (778980673) 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, 223672 + ... + 227127.

It is an arithmetic number, because the mean of its divisors is an integer number (40894000).

Almost surely, 2^778980672 is an apocalyptic number.

778980672 is a gapful number since it is divisible by the number (72) formed by its first and last digit.

It is an amenable number.

778980672 is an abundant number, since it is smaller than the sum of its proper divisors (1511083328).

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

778980672 is a wasteful number, since it uses less digits than its factorization.

778980672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 450820 (or 450804 counting only the distinct ones).

The product of its (nonzero) digits is 2370816, while the sum is 54.

The square root of 778980672 is about 27910.2252230253. The cubic root of 778980672 is about 920.1152470623.

The spelling of 778980672 in words is "seven hundred seventy-eight million, nine hundred eighty thousand, six hundred seventy-two".