77257772240 has 80 divisors (see below), whose sum is σ = 196265759616. Its totient is φ = 28049011200.

The previous prime is 77257772237. The next prime is 77257772287. The reversal of 77257772240 is 4227775277.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 485714 + ... + 624846.

Almost surely, 2^77257772240 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 77257772240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98132879808).

77257772240 is an abundant number, since it is smaller than the sum of its proper divisors (119007987376).

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

77257772240 is a wasteful number, since it uses less digits than its factorization.

77257772240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139788 (or 139782 counting only the distinct ones).

The product of its (nonzero) digits is 2689120, while the sum is 50.

The spelling of 77257772240 in words is "seventy-seven billion, two hundred fifty-seven million, seven hundred seventy-two thousand, two hundred forty".