645033442 has 16 divisors (see below), whose sum is σ = 979355520. Its totient is φ = 318599568.

The previous prime is 645033427. The next prime is 645033449. The reversal of 645033442 is 244330546.

It is not an unprimeable number, because it can be changed into a prime (645033449) 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, 71383 + ... + 79909.

It is an arithmetic number, because the mean of its divisors is an integer number (61209720).

Almost surely, 2^645033442 is an apocalyptic number.

645033442 is a deficient number, since it is larger than the sum of its proper divisors (334322078).

645033442 is a wasteful number, since it uses less digits than its factorization.

645033442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8985.

The product of its (nonzero) digits is 34560, while the sum is 31.

The square root of 645033442 is about 25397.5085785988. The cubic root of 645033442 is about 864.0271919668.

Adding to 645033442 its reverse (244330546), we get a palindrome (889363988).

The spelling of 645033442 in words is "six hundred forty-five million, thirty-three thousand, four hundred forty-two".