645097786 has 16 divisors (see below), whose sum is σ = 1000689408. Its totient is φ = 311572800.

The previous prime is 645097781. The next prime is 645097811. The reversal of 645097786 is 687790546.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (645097781) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25666 + ... + 44146.

It is an arithmetic number, because the mean of its divisors is an integer number (62543088).

Almost surely, 2^645097786 is an apocalyptic number.

645097786 is a deficient number, since it is larger than the sum of its proper divisors (355591622).

645097786 is a wasteful number, since it uses less digits than its factorization.

645097786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19077.

The product of its (nonzero) digits is 2540160, while the sum is 52.

The square root of 645097786 is about 25398.7752854345. The cubic root of 645097786 is about 864.0559207704.

The spelling of 645097786 in words is "six hundred forty-five million, ninety-seven thousand, seven hundred eighty-six".