641378526 has 16 divisors (see below), whose sum is σ = 1291987200. Its totient is φ = 212254488.

The previous prime is 641378519. The next prime is 641378527. The reversal of 641378526 is 625873146.

It is a super-2 number, since 2×641378526² = 822732827227865352, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641378527) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 383686 + ... + 385353.

It is an arithmetic number, because the mean of its divisors is an integer number (80749200).

Almost surely, 2^641378526 is an apocalyptic number.

641378526 is an abundant number, since it is smaller than the sum of its proper divisors (650608674).

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

641378526 is a wasteful number, since it uses less digits than its factorization.

641378526 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 769183.

The product of its digits is 241920, while the sum is 42.

The square root of 641378526 is about 25325.4521381159. The cubic root of 641378526 is about 862.3921706828.

The spelling of 641378526 in words is "six hundred forty-one million, three hundred seventy-eight thousand, five hundred twenty-six".