645533246 has 8 divisors (see below), whose sum is σ = 1019263080. Its totient is φ = 305778888.

The previous prime is 645533221. The next prime is 645533263. The reversal of 645533246 is 642335546.

It is a happy number.

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

It is a Harshad number since it is a multiple of its sum of digits (38), and also a Moran number because the ratio is a prime number: 16987717 = 645533246 / (6 + 4 + 5 + 5 + 3 + 3 + 2 + 4 + 6).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8493821 + ... + 8493896.

It is an arithmetic number, because the mean of its divisors is an integer number (127407885).

Almost surely, 2^645533246 is an apocalyptic number.

645533246 is a deficient number, since it is larger than the sum of its proper divisors (373729834).

645533246 is a wasteful number, since it uses less digits than its factorization.

645533246 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16987738.

The product of its digits is 259200, while the sum is 38.

The square root of 645533246 is about 25407.3462998401. The cubic root of 645533246 is about 864.2502981028.

The spelling of 645533246 in words is "six hundred forty-five million, five hundred thirty-three thousand, two hundred forty-six".