77947940870 has 16 divisors (see below), whose sum is σ = 145144442160. Its totient is φ = 30104032224.

The previous prime is 77947940771. The next prime is 77947940887. The reversal of 77947940870 is 7804974977.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 134392712 + ... + 134393291.

It is an arithmetic number, because the mean of its divisors is an integer number (9071527635).

Almost surely, 2^77947940870 is an apocalyptic number.

77947940870 is a deficient number, since it is larger than the sum of its proper divisors (67196501290).

77947940870 is a wasteful number, since it uses less digits than its factorization.

77947940870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268786039.

The product of its (nonzero) digits is 24893568, while the sum is 62.

The spelling of 77947940870 in words is "seventy-seven billion, nine hundred forty-seven million, nine hundred forty thousand, eight hundred seventy".