77811400444 has 24 divisors (see below), whose sum is σ = 137965464000. Its totient is φ = 38393209920.

The previous prime is 77811400411. The next prime is 77811400453. The reversal of 77811400444 is 44400411877.

It is a super-2 number, since 2×77811400444² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 77811400397 and 77811400406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 552714 + ... + 679054.

It is an arithmetic number, because the mean of its divisors is an integer number (5748561000).

Almost surely, 2^77811400444 is an apocalyptic number.

It is an amenable number.

77811400444 is a deficient number, since it is larger than the sum of its proper divisors (60154063556).

77811400444 is a wasteful number, since it uses less digits than its factorization.

77811400444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128373 (or 128371 counting only the distinct ones).

The product of its (nonzero) digits is 100352, while the sum is 40.

The spelling of 77811400444 in words is "seventy-seven billion, eight hundred eleven million, four hundred thousand, four hundred forty-four".