645371754 has 8 divisors (see below), whose sum is σ = 1290743520. Its totient is φ = 215123916.

The previous prime is 645371747. The next prime is 645371759. The reversal of 645371754 is 457173546.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

645371754 is an admirable number.

It is a super-2 number, since 2×645371754² = 833009401722073032, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (645371759) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53780974 + ... + 53780985.

It is an arithmetic number, because the mean of its divisors is an integer number (161342940).

Almost surely, 2^645371754 is an apocalyptic number.

645371754 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

645371754 is a wasteful number, since it uses less digits than its factorization.

645371754 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107561964.

The product of its digits is 352800, while the sum is 42.

The square root of 645371754 is about 25404.1680438467. The cubic root of 645371754 is about 864.1782227294.

The spelling of 645371754 in words is "six hundred forty-five million, three hundred seventy-one thousand, seven hundred fifty-four".