77137279240 has 128 divisors (see below), whose sum is σ = 199272960000. Its totient is φ = 26324782848.

The previous prime is 77137279223. The next prime is 77137279243. The reversal of 77137279240 is 4297273177.

It is not an unprimeable number, because it can be changed into a prime (77137279243) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 103818309 + ... + 103819051.

It is an arithmetic number, because the mean of its divisors is an integer number (1556820000).

Almost surely, 2^77137279240 is an apocalyptic number.

77137279240 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 77137279240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99636480000).

77137279240 is an abundant number, since it is smaller than the sum of its proper divisors (122135680760).

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

77137279240 is a wasteful number, since it uses less digits than its factorization.

77137279240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1979 (or 1975 counting only the distinct ones).

The product of its (nonzero) digits is 1037232, while the sum is 49.

The spelling of 77137279240 in words is "seventy-seven billion, one hundred thirty-seven million, two hundred seventy-nine thousand, two hundred forty".