645426572 has 24 divisors (see below), whose sum is σ = 1332495360. Its totient is φ = 267688080.

The previous prime is 645426571. The next prime is 645426583. The reversal of 645426572 is 275624546.

645426572 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (645426571) 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, 370922 + ... + 372657.

It is an arithmetic number, because the mean of its divisors is an integer number (55520640).

Almost surely, 2^645426572 is an apocalyptic number.

645426572 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is an amenable number.

645426572 is an abundant number, since it is smaller than the sum of its proper divisors (687068788).

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

645426572 is a wasteful number, since it uses less digits than its factorization.

645426572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 743621 (or 743619 counting only the distinct ones).

The product of its digits is 403200, while the sum is 41.

The square root of 645426572 is about 25405.2469383787. The cubic root of 645426572 is about 864.2026898577.

The spelling of 645426572 in words is "six hundred forty-five million, four hundred twenty-six thousand, five hundred seventy-two".