645442134 has 32 divisors (see below), whose sum is σ = 1368554496. Its totient is φ = 202577760.

The previous prime is 645442099. The next prime is 645442153. The reversal of 645442134 is 431244546.

It is a happy number.

645442134 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 645442095 and 645442104.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40012 + ... + 53775.

It is an arithmetic number, because the mean of its divisors is an integer number (42767328).

Almost surely, 2^645442134 is an apocalyptic number.

645442134 is an abundant number, since it is smaller than the sum of its proper divisors (723112362).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

645442134 is a wasteful number, since it uses less digits than its factorization.

645442134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93860.

The product of its digits is 46080, while the sum is 33.

The square root of 645442134 is about 25405.5532118472. The cubic root of 645442134 is about 864.2096354524.

The spelling of 645442134 in words is "six hundred forty-five million, four hundred forty-two thousand, one hundred thirty-four".