645454506 has 8 divisors (see below), whose sum is σ = 1290909024. Its totient is φ = 215151500.

The previous prime is 645454501. The next prime is 645454517. The reversal of 645454506 is 605454546.

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

645454506 is an admirable number.

It is a super-2 number, since 2×645454506² = 833223038631408072, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (645454501) 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, 53787870 + ... + 53787881.

It is an arithmetic number, because the mean of its divisors is an integer number (161363628).

Almost surely, 2^645454506 is an apocalyptic number.

645454506 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.

645454506 is a wasteful number, since it uses less digits than its factorization.

645454506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107575756.

The product of its (nonzero) digits is 288000, while the sum is 39.

The square root of 645454506 is about 25405.7967007532. The cubic root of 645454506 is about 864.2151572143.

The spelling of 645454506 in words is "six hundred forty-five million, four hundred fifty-four thousand, five hundred six".