77213671887 has 64 divisors (see below), whose sum is σ = 118278144000. Its totient is φ = 44349064320.

The previous prime is 77213671867. The next prime is 77213671957. The reversal of 77213671887 is 78817631277.

It is a de Polignac number, because none of the positive numbers 2^k-77213671887 is a prime.

It is a super-2 number, since 2×77213671887² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77213671837) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 70002778 + ... + 70003880.

It is an arithmetic number, because the mean of its divisors is an integer number (1848096000).

Almost surely, 2^77213671887 is an apocalyptic number.

77213671887 is a deficient number, since it is larger than the sum of its proper divisors (41064472113).

77213671887 is a wasteful number, since it uses less digits than its factorization.

77213671887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1908.

The product of its digits is 5531904, while the sum is 57.

The spelling of 77213671887 in words is "seventy-seven billion, two hundred thirteen million, six hundred seventy-one thousand, eight hundred eighty-seven".