645526442 has 16 divisors (see below), whose sum is σ = 1056737664. Its totient is φ = 293304000.

The previous prime is 645526433. The next prime is 645526471. The reversal of 645526442 is 244625546.

It is a junction number, because it is equal to n+sod(n) for n = 645526396 and 645526405.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75842 + ... + 83922.

It is an arithmetic number, because the mean of its divisors is an integer number (66046104).

Almost surely, 2^645526442 is an apocalyptic number.

645526442 is a deficient number, since it is larger than the sum of its proper divisors (411211222).

645526442 is a wasteful number, since it uses less digits than its factorization.

645526442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11725.

The product of its digits is 230400, while the sum is 38.

The square root of 645526442 is about 25407.2124012061. The cubic root of 645526442 is about 864.2472616573.

The spelling of 645526442 in words is "six hundred forty-five million, five hundred twenty-six thousand, four hundred forty-two".