618440978 has 16 divisors (see below), whose sum is σ = 944262144. Its totient is φ = 303735600.

The previous prime is 618440971. The next prime is 618440983. The reversal of 618440978 is 879044816.

It is not an unprimeable number, because it can be changed into a prime (618440971) 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 7 ways as a sum of consecutive naturals, for example, 13601 + ... + 37707.

It is an arithmetic number, because the mean of its divisors is an integer number (59016384).

Almost surely, 2^618440978 is an apocalyptic number.

618440978 is a deficient number, since it is larger than the sum of its proper divisors (325821166).

618440978 is a wasteful number, since it uses less digits than its factorization.

618440978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24337.

The product of its (nonzero) digits is 387072, while the sum is 47.

The square root of 618440978 is about 24868.4735759958. The cubic root of 618440978 is about 851.9865774444.

The spelling of 618440978 in words is "six hundred eighteen million, four hundred forty thousand, nine hundred seventy-eight".