645002997 has 8 divisors (see below), whose sum is σ = 866569440. Its totient is φ = 426719280.

The previous prime is 645002929. The next prime is 645003017. The reversal of 645002997 is 799200546.

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

It is not a de Polignac number, because 645002997 - 2¹² = 644998901 is a prime.

It is a super-2 number, since 2×645002997² = 832057732277964018, which contains 22 as substring.

645002997 is a modest number, since divided by 2997 gives 645 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645002297) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 820222 + ... + 821007.

It is an arithmetic number, because the mean of its divisors is an integer number (108321180).

Almost surely, 2^645002997 is an apocalyptic number.

It is an amenable number.

645002997 is a deficient number, since it is larger than the sum of its proper divisors (221566443).

645002997 is a wasteful number, since it uses less digits than its factorization.

645002997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1641363.

The product of its (nonzero) digits is 136080, while the sum is 42.

The square root of 645002997 is about 25396.9092017119. The cubic root of 645002997 is about 864.0135979834.

The spelling of 645002997 in words is "six hundred forty-five million, two thousand, nine hundred ninety-seven".