779491943820 has 144 divisors (see below), whose sum is σ = 2490721440480. Its totient is φ = 196780492800.

The previous prime is 779491943761. The next prime is 779491943869. The reversal of 779491943820 is 28349194977.

779491943820 is a `hidden beast` number, since 7 + 7 + 9 + 491 + 94 + 38 + 20 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4640500 + ... + 4805540.

It is an arithmetic number, because the mean of its divisors is an integer number (17296676670).

Almost surely, 2^779491943820 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 779491943820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1245360720240).

779491943820 is an abundant number, since it is smaller than the sum of its proper divisors (1711229496660).

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

779491943820 is a wasteful number, since it uses less digits than its factorization.

779491943820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166456 (or 166451 counting only the distinct ones).

The product of its (nonzero) digits is 27433728, while the sum is 63.

The spelling of 779491943820 in words is "seven hundred seventy-nine billion, four hundred ninety-one million, nine hundred forty-three thousand, eight hundred twenty".