640597442 has 8 divisors (see below), whose sum is σ = 961049232. Its totient is φ = 320247700.

The previous prime is 640597421. The next prime is 640597459. The reversal of 640597442 is 244795046.

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

It is a self number, because there is not a number n which added to its sum of digits gives 640597442.

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, 7184 + ... + 36507.

It is an arithmetic number, because the mean of its divisors is an integer number (120131154).

Almost surely, 2^640597442 is an apocalyptic number.

640597442 is a deficient number, since it is larger than the sum of its proper divisors (320451790).

640597442 is a wasteful number, since it uses less digits than its factorization.

640597442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51024.

The product of its (nonzero) digits is 241920, while the sum is 41.

The square root of 640597442 is about 25310.0265112465. The cubic root of 640597442 is about 862.0419488165.

The spelling of 640597442 in words is "six hundred forty million, five hundred ninety-seven thousand, four hundred forty-two".