77912789406 has 16 divisors (see below), whose sum is σ = 156047877648. Its totient is φ = 25933880000.

The previous prime is 77912789393. The next prime is 77912789407. The reversal of 77912789406 is 60498721977.

It is a self number, because there is not a number n which added to its sum of digits gives 77912789406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77912789407) 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, 9257895 + ... + 9266306.

It is an arithmetic number, because the mean of its divisors is an integer number (9752992353).

Almost surely, 2^77912789406 is an apocalyptic number.

77912789406 is an abundant number, since it is smaller than the sum of its proper divisors (78135088242).

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

77912789406 is a wasteful number, since it uses less digits than its factorization.

77912789406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18524907.

The product of its (nonzero) digits is 10668672, while the sum is 60.

The spelling of 77912789406 in words is "seventy-seven billion, nine hundred twelve million, seven hundred eighty-nine thousand, four hundred six".