645339037 has 8 divisors (see below), whose sum is σ = 769597056. Its totient is φ = 529097712.

The previous prime is 645339017. The next prime is 645339049. The reversal of 645339037 is 730933546.

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

It is a cyclic number.

It is not a de Polignac number, because 645339037 - 2⁷ = 645338909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645339007) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2003998 + ... + 2004319.

It is an arithmetic number, because the mean of its divisors is an integer number (96199632).

Almost surely, 2^645339037 is an apocalyptic number.

It is an amenable number.

645339037 is a deficient number, since it is larger than the sum of its proper divisors (124258019).

645339037 is a wasteful number, since it uses less digits than its factorization.

645339037 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4008347.

The product of its (nonzero) digits is 204120, while the sum is 40.

The square root of 645339037 is about 25403.5241059188. The cubic root of 645339037 is about 864.1636193650.

The spelling of 645339037 in words is "six hundred forty-five million, three hundred thirty-nine thousand, thirty-seven".