645032552 has 8 divisors (see below), whose sum is σ = 1209436050. Its totient is φ = 322516272.

The previous prime is 645032543. The next prime is 645032611. The reversal of 645032552 is 255230546.

It can be written as a sum of positive squares in only one way, i.e., 569585956 + 75446596 = 23866^2 + 8686^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40314527 + ... + 40314542.

Almost surely, 2^645032552 is an apocalyptic number.

It is an amenable number.

645032552 is a deficient number, since it is larger than the sum of its proper divisors (564403498).

645032552 is a wasteful number, since it uses less digits than its factorization.

645032552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80629075 (or 80629071 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 32.

The square root of 645032552 is about 25397.4910571891. The cubic root of 645032552 is about 864.0267945794.

The spelling of 645032552 in words is "six hundred forty-five million, thirty-two thousand, five hundred fifty-two".