645410854 has 12 divisors (see below), whose sum is σ = 1064128212. Its totient is φ = 293368460.

The previous prime is 645410833. The next prime is 645410897. The reversal of 645410854 is 458014546.

It is a super-2 number, since 2×645410854² = 833110340922018632, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1333252 + ... + 1333735.

It is an arithmetic number, because the mean of its divisors is an integer number (88677351).

Almost surely, 2^645410854 is an apocalyptic number.

645410854 is a deficient number, since it is larger than the sum of its proper divisors (418717358).

645410854 is a wasteful number, since it uses less digits than its factorization.

645410854 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2667011 (or 2667000 counting only the distinct ones).

The product of its (nonzero) digits is 76800, while the sum is 37.

The square root of 645410854 is about 25404.9375909487. The cubic root of 645410854 is about 864.1956745241.

The spelling of 645410854 in words is "six hundred forty-five million, four hundred ten thousand, eight hundred fifty-four".