618989994 has 48 divisors (see below), whose sum is σ = 1534336128. Its totient is φ = 176669856.

The previous prime is 618989993. The next prime is 618990011. The reversal of 618989994 is 499989816.

618989994 is a `hidden beast` number, since 618 + 9 + 8 + 9 + 9 + 9 + 4 = 666.

It is a super-2 number, since 2×618989994² = 766297225344240072, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (618989993) by changing a digit.

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 in 23 ways as a sum of consecutive naturals, for example, 158979 + ... + 162825.

It is an arithmetic number, because the mean of its divisors is an integer number (31965336).

Almost surely, 2^618989994 is an apocalyptic number.

618989994 is an abundant number, since it is smaller than the sum of its proper divisors (915346134).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

618989994 is a wasteful number, since it uses less digits than its factorization.

618989994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5139 (or 5136 counting only the distinct ones).

The product of its digits is 10077696, while the sum is 63.

The square root of 618989994 is about 24879.5095208889. The cubic root of 618989994 is about 852.2386176188.

The spelling of 618989994 in words is "six hundred eighteen million, nine hundred eighty-nine thousand, nine hundred ninety-four".