78539400770 has 16 divisors (see below), whose sum is σ = 143160428160. Its totient is φ = 31018092144.

The previous prime is 78539400761. The next prime is 78539400773. The reversal of 78539400770 is 7700493587.

It is not an unprimeable number, because it can be changed into a prime (78539400773) 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, 49707692 + ... + 49709271.

It is an arithmetic number, because the mean of its divisors is an integer number (8947526760).

Almost surely, 2^78539400770 is an apocalyptic number.

78539400770 is a deficient number, since it is larger than the sum of its proper divisors (64621027390).

78539400770 is a wasteful number, since it uses less digits than its factorization.

78539400770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99417049.

The product of its (nonzero) digits is 1481760, while the sum is 50.

The spelling of 78539400770 in words is "seventy-eight billion, five hundred thirty-nine million, four hundred thousand, seven hundred seventy".