6391079780 has 24 divisors (see below), whose sum is σ = 14127650880. Its totient is φ = 2421882720.

The previous prime is 6391079771. The next prime is 6391079789. The reversal of 6391079780 is 879701936.

It is an interprime number because it is at equal distance from previous prime (6391079771) and next prime (6391079789).

It is not an unprimeable number, because it can be changed into a prime (6391079789) 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, 8408936 + ... + 8409695.

It is an arithmetic number, because the mean of its divisors is an integer number (588652120).

Almost surely, 2^6391079780 is an apocalyptic number.

It is an amenable number.

6391079780 is an abundant number, since it is smaller than the sum of its proper divisors (7736571100).

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

6391079780 is a wasteful number, since it uses less digits than its factorization.

6391079780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16818659 (or 16818657 counting only the distinct ones).

The product of its (nonzero) digits is 571536, while the sum is 50.

The square root of 6391079780 is about 79944.2291851013. The cubic root of 6391079780 is about 1855.7725491840.

The spelling of 6391079780 in words is "six billion, three hundred ninety-one million, seventy-nine thousand, seven hundred eighty".