77660005220 has 48 divisors (see below), whose sum is σ = 191421431040. Its totient is φ = 25906656384.

The previous prime is 77660005207. The next prime is 77660005223. The reversal of 77660005220 is 2250006677.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is not an unprimeable number, because it can be changed into a prime (77660005223) 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, 7490960 + ... + 7501319.

It is an arithmetic number, because the mean of its divisors is an integer number (3987946480).

Almost surely, 2^77660005220 is an apocalyptic number.

77660005220 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

77660005220 is an abundant number, since it is smaller than the sum of its proper divisors (113761425820).

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

77660005220 is a wasteful number, since it uses less digits than its factorization.

77660005220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14992332 (or 14992330 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 35.

The spelling of 77660005220 in words is "seventy-seven billion, six hundred sixty million, five thousand, two hundred twenty".