618398864 has 10 divisors (see below), whose sum is σ = 1198147830. Its totient is φ = 309199424.

The previous prime is 618398863. The next prime is 618398897. The reversal of 618398864 is 468893816.

It can be written as a sum of positive squares in only one way, i.e., 355699600 + 262699264 = 18860^2 + 16208^2 .

It is not an unprimeable number, because it can be changed into a prime (618398863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19324949 + ... + 19324980.

It is an arithmetic number, because the mean of its divisors is an integer number (119814783).

Almost surely, 2^618398864 is an apocalyptic number.

It is an amenable number.

618398864 is a deficient number, since it is larger than the sum of its proper divisors (579748966).

618398864 is a wasteful number, since it uses less digits than its factorization.

618398864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38649937 (or 38649931 counting only the distinct ones).

The product of its digits is 1990656, while the sum is 53.

The square root of 618398864 is about 24867.6268268607. The cubic root of 618398864 is about 851.9672377507.

The spelling of 618398864 in words is "six hundred eighteen million, three hundred ninety-eight thousand, eight hundred sixty-four".