618446672 has 20 divisors (see below), whose sum is σ = 1268725716. Its totient is φ = 291033600.

The previous prime is 618446659. The next prime is 618446687. The reversal of 618446672 is 276644816.

It can be written as a sum of positive squares in 2 ways, for example, as 184307776 + 434138896 = 13576^2 + 20836^2 .

It is a super-2 number, since 2×618446672² = 764952572215751168, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1136579 + ... + 1137122.

Almost surely, 2^618446672 is an apocalyptic number.

It is an amenable number.

618446672 is an abundant number, since it is smaller than the sum of its proper divisors (650279044).

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

618446672 is a wasteful number, since it uses less digits than its factorization.

618446672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2273726 (or 2273720 counting only the distinct ones).

The product of its digits is 387072, while the sum is 44.

The square root of 618446672 is about 24868.5880580302. The cubic root of 618446672 is about 851.9891921895.

The spelling of 618446672 in words is "six hundred eighteen million, four hundred forty-six thousand, six hundred seventy-two".