77009811987 has 8 divisors (see below), whose sum is σ = 102690994320. Its totient is φ = 51334252160.

The previous prime is 77009811979. The next prime is 77009812067. The reversal of 77009811987 is 78911890077.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 77009811987 - 2³ = 77009811979 is a prime.

It is a super-2 number, since 2×77009811987² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (77009811917) 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, 1373562 + ... + 1428527.

It is an arithmetic number, because the mean of its divisors is an integer number (12836374290).

Almost surely, 2^77009811987 is an apocalyptic number.

77009811987 is a deficient number, since it is larger than the sum of its proper divisors (25681182333).

77009811987 is a wasteful number, since it uses less digits than its factorization.

77009811987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2811253.

The product of its (nonzero) digits is 1778112, while the sum is 57.

The spelling of 77009811987 in words is "seventy-seven billion, nine million, eight hundred eleven thousand, nine hundred eighty-seven".