77641451988 has 48 divisors (see below), whose sum is σ = 182168030016. Its totient is φ = 25737062400.

The previous prime is 77641451959. The next prime is 77641452017. The reversal of 77641451988 is 88915414677.

It is an interprime number because it is at equal distance from previous prime (77641451959) and next prime (77641452017).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9822838 + ... + 9830738.

It is an arithmetic number, because the mean of its divisors is an integer number (3795167292).

Almost surely, 2^77641451988 is an apocalyptic number.

It is an amenable number.

77641451988 is an abundant number, since it is smaller than the sum of its proper divisors (104526578028).

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

77641451988 is a wasteful number, since it uses less digits than its factorization.

77641451988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12344 (or 12342 counting only the distinct ones).

The product of its digits is 13547520, while the sum is 60.

The spelling of 77641451988 in words is "seventy-seven billion, six hundred forty-one million, four hundred fifty-one thousand, nine hundred eighty-eight".