77801447220 has 96 divisors (see below), whose sum is σ = 250268368896. Its totient is φ = 17690064000.

The previous prime is 77801447173. The next prime is 77801447233. The reversal of 77801447220 is 2274410877.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 404706 + ... + 565145.

It is an arithmetic number, because the mean of its divisors is an integer number (2606962176).

Almost surely, 2^77801447220 is an apocalyptic number.

77801447220 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

77801447220 is an abundant number, since it is smaller than the sum of its proper divisors (172466921676).

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

77801447220 is a wasteful number, since it uses less digits than its factorization.

77801447220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 970061 (or 970059 counting only the distinct ones).

The product of its (nonzero) digits is 175616, while the sum is 42.

The spelling of 77801447220 in words is "seventy-seven billion, eight hundred one million, four hundred forty-seven thousand, two hundred twenty".