77797653480 has 96 divisors (see below), whose sum is σ = 253094142600. Its totient is φ = 20725383168.

The previous prime is 77797653473. The next prime is 77797653491. The reversal of 77797653480 is 8435679777.

77797653480 is a `hidden beast` number, since 7 + 7 + 7 + 97 + 6 + 534 + 8 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 69066993636 + 8730659844 = 262806^2 + 93438^2 .

It is a super-2 number, since 2×77797653480² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 256152 + ... + 470328.

Almost surely, 2^77797653480 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 77797653480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (126547071300).

77797653480 is an abundant number, since it is smaller than the sum of its proper divisors (175296489120).

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

77797653480 is a wasteful number, since it uses less digits than its factorization.

77797653480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215203 (or 215196 counting only the distinct ones).

The product of its (nonzero) digits is 62233920, while the sum is 63.

The spelling of 77797653480 in words is "seventy-seven billion, seven hundred ninety-seven million, six hundred fifty-three thousand, four hundred eighty".