77071991040 has 216 divisors, whose sum is σ = 290903453568. Its totient is φ = 18684088320.

The previous prime is 77071991033. The next prime is 77071991041. The reversal of 77071991040 is 4019917077.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (77071991041) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 177384 + ... + 430823.

It is an arithmetic number, because the mean of its divisors is an integer number (1346775248).

Almost surely, 2^77071991040 is an apocalyptic number.

It is an amenable number.

77071991040 is an abundant number, since it is smaller than the sum of its proper divisors (213831462528).

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

77071991040 is a wasteful number, since it uses less digits than its factorization.

77071991040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 608245 (or 608228 counting only the distinct ones).

The product of its (nonzero) digits is 111132, while the sum is 45.

The spelling of 77071991040 in words is "seventy-seven billion, seventy-one million, nine hundred ninety-one thousand, forty".