77397151920 has 320 divisors, whose sum is σ = 272019161088. Its totient is φ = 18034560000.

The previous prime is 77397151891. The next prime is 77397151921. The reversal of 77397151920 is 2915179377.

It is not an unprimeable number, because it can be changed into a prime (77397151921) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 12354709 + ... + 12360971.

Almost surely, 2^77397151920 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 77397151920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (136009580544).

77397151920 is an abundant number, since it is smaller than the sum of its proper divisors (194622009168).

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

77397151920 is a wasteful number, since it uses less digits than its factorization.

77397151920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6472 (or 6466 counting only the distinct ones).

The product of its (nonzero) digits is 833490, while the sum is 51.

The spelling of 77397151920 in words is "seventy-seven billion, three hundred ninety-seven million, one hundred fifty-one thousand, nine hundred twenty".