645157076 has 6 divisors (see below), whose sum is σ = 1129024890. Its totient is φ = 322578536.

The previous prime is 645157057. The next prime is 645157111. The reversal of 645157076 is 670751546.

It can be written as a sum of positive squares in only one way, i.e., 358193476 + 286963600 = 18926^2 + 16940^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80644631 + ... + 80644638.

It is an arithmetic number, because the mean of its divisors is an integer number (188170815).

Almost surely, 2^645157076 is an apocalyptic number.

It is an amenable number.

645157076 is a deficient number, since it is larger than the sum of its proper divisors (483867814).

645157076 is a wasteful number, since it uses less digits than its factorization.

645157076 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161289273 (or 161289271 counting only the distinct ones).

The product of its (nonzero) digits is 176400, while the sum is 41.

The square root of 645157076 is about 25399.9424408797. The cubic root of 645157076 is about 864.0823913341.

The spelling of 645157076 in words is "six hundred forty-five million, one hundred fifty-seven thousand, seventy-six".