645035876 has 6 divisors (see below), whose sum is σ = 1128812790. Its totient is φ = 322517936.

The previous prime is 645035873. The next prime is 645035927. The reversal of 645035876 is 678530546.

It can be written as a sum of positive squares in only one way, i.e., 579846400 + 65189476 = 24080^2 + 8074^2 .

It is not an unprimeable number, because it can be changed into a prime (645035873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80629481 + ... + 80629488.

It is an arithmetic number, because the mean of its divisors is an integer number (188135465).

Almost surely, 2^645035876 is an apocalyptic number.

It is an amenable number.

645035876 is a deficient number, since it is larger than the sum of its proper divisors (483776914).

645035876 is a wasteful number, since it uses less digits than its factorization.

645035876 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161258973 (or 161258971 counting only the distinct ones).

The product of its (nonzero) digits is 604800, while the sum is 44.

The square root of 645035876 is about 25397.5564966396. The cubic root of 645035876 is about 864.0282787526.

The spelling of 645035876 in words is "six hundred forty-five million, thirty-five thousand, eight hundred seventy-six".