641776380 has 96 divisors (see below), whose sum is σ = 2124541440. Its totient is φ = 141630720.

The previous prime is 641776379. The next prime is 641776391. The reversal of 641776380 is 83677146.

641776380 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 (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, 14166 + ... + 38525.

It is an arithmetic number, because the mean of its divisors is an integer number (22130640).

Almost surely, 2^641776380 is an apocalyptic number.

641776380 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

641776380 is an abundant number, since it is smaller than the sum of its proper divisors (1482765060).

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

641776380 is a wasteful number, since it uses less digits than its factorization.

641776380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52739 (or 52737 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 42.

The square root of 641776380 is about 25333.3057455990. The cubic root of 641776380 is about 862.5704508720.

The spelling of 641776380 in words is "six hundred forty-one million, seven hundred seventy-six thousand, three hundred eighty".