645554750 has 16 divisors (see below), whose sum is σ = 1208478960. Its totient is φ = 258221800.

The previous prime is 645554713. The next prime is 645554771. The reversal of 645554750 is 57455546.

It is a junction number, because it is equal to n+sod(n) for n = 645554698 and 645554707.

It is a congruent number.

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, 1290860 + ... + 1291359.

It is an arithmetic number, because the mean of its divisors is an integer number (75529935).

Almost surely, 2^645554750 is an apocalyptic number.

645554750 is a deficient number, since it is larger than the sum of its proper divisors (562924210).

645554750 is a wasteful number, since it uses less digits than its factorization.

645554750 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2582236 (or 2582226 counting only the distinct ones).

The product of its (nonzero) digits is 420000, while the sum is 41.

The square root of 645554750 is about 25407.7694810072. The cubic root of 645554750 is about 864.2598946300.

The spelling of 645554750 in words is "six hundred forty-five million, five hundred fifty-four thousand, seven hundred fifty".