641402772 has 24 divisors (see below), whose sum is σ = 1544884992. Its totient is φ = 206904000.

The previous prime is 641402759. The next prime is 641402777. The reversal of 641402772 is 277204146.

It is a super-2 number, since 2×641402772² = 822795031858567968, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641402777) 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, 861729 + ... + 862472.

It is an arithmetic number, because the mean of its divisors is an integer number (64370208).

Almost surely, 2^641402772 is an apocalyptic number.

641402772 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is an amenable number.

641402772 is an abundant number, since it is smaller than the sum of its proper divisors (903482220).

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

641402772 is a wasteful number, since it uses less digits than its factorization.

641402772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1724239 (or 1724237 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 33.

The square root of 641402772 is about 25325.9308219856. The cubic root of 641402772 is about 862.4030375351.

The spelling of 641402772 in words is "six hundred forty-one million, four hundred two thousand, seven hundred seventy-two".