77898857906 has 48 divisors (see below), whose sum is σ = 124754570304. Its totient is φ = 36452420928.

The previous prime is 77898857867. The next prime is 77898857977. The reversal of 77898857906 is 60975889877.

It is a Harshad number since it is a multiple of its sum of digits (74).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17610011 + ... + 17614433.

It is an arithmetic number, because the mean of its divisors is an integer number (2599053548).

Almost surely, 2^77898857906 is an apocalyptic number.

77898857906 is a deficient number, since it is larger than the sum of its proper divisors (46855712398).

77898857906 is a wasteful number, since it uses less digits than its factorization.

77898857906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4803 (or 4774 counting only the distinct ones).

The product of its (nonzero) digits is 426746880, while the sum is 74.

The spelling of 77898857906 in words is "seventy-seven billion, eight hundred ninety-eight million, eight hundred fifty-seven thousand, nine hundred six".