647564643780 has 48 divisors (see below), whose sum is σ = 1835026570944. Its totient is φ = 170603374720.

The previous prime is 647564643757. The next prime is 647564643809. The reversal of 647564643780 is 87346465746.

647564643780 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 65011551 + ... + 65021510.

It is an arithmetic number, because the mean of its divisors is an integer number (38229720228).

Almost surely, 2^647564643780 is an apocalyptic number.

647564643780 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

647564643780 is an abundant number, since it is smaller than the sum of its proper divisors (1187461927164).

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

647564643780 is a wasteful number, since it uses less digits than its factorization.

647564643780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130033156 (or 130033154 counting only the distinct ones).

The product of its (nonzero) digits is 81285120, while the sum is 60.

The spelling of 647564643780 in words is "six hundred forty-seven billion, five hundred sixty-four million, six hundred forty-three thousand, seven hundred eighty".