77801257644 has 48 divisors (see below), whose sum is σ = 198684748416. Its totient is φ = 23499331200.

The previous prime is 77801257613. The next prime is 77801257649. The reversal of 77801257644 is 44675210877.

It is not an unprimeable number, because it can be changed into a prime (77801257649) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 919417 + ... + 1000464.

It is an arithmetic number, because the mean of its divisors is an integer number (4139265592).

Almost surely, 2^77801257644 is an apocalyptic number.

It is an amenable number.

77801257644 is an abundant number, since it is smaller than the sum of its proper divisors (120883490772).

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

77801257644 is a wasteful number, since it uses less digits than its factorization.

77801257644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1920206 (or 1920204 counting only the distinct ones).

The product of its (nonzero) digits is 2634240, while the sum is 51.

The spelling of 77801257644 in words is "seventy-seven billion, eight hundred one million, two hundred fifty-seven thousand, six hundred forty-four".