618978450 has 24 divisors (see below), whose sum is σ = 1535066928. Its totient is φ = 165060880.

The previous prime is 618978443. The next prime is 618978463. The reversal of 618978450 is 54879816.

It is a self number, because there is not a number n which added to its sum of digits gives 618978450.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2063112 + ... + 2063411.

It is an arithmetic number, because the mean of its divisors is an integer number (63961122).

Almost surely, 2^618978450 is an apocalyptic number.

618978450 is an abundant number, since it is smaller than the sum of its proper divisors (916088478).

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

618978450 is a wasteful number, since it uses less digits than its factorization.

618978450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4126538 (or 4126533 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 48.

The square root of 618978450 is about 24879.2775216645. The cubic root of 618978450 is about 852.2333195775.

The spelling of 618978450 in words is "six hundred eighteen million, nine hundred seventy-eight thousand, four hundred fifty".