618432408 has 160 divisors (see below), whose sum is σ = 1926484560. Its totient is φ = 183755520.

The previous prime is 618432403. The next prime is 618432413. The reversal of 618432408 is 804234816.

618432408 is a `hidden beast` number, since 618 + 4 + 32 + 4 + 0 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (618432403) and next prime (618432413).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (618432401) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 376966 + ... + 378602.

Almost surely, 2^618432408 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 618432408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (963242280).

618432408 is an abundant number, since it is smaller than the sum of its proper divisors (1308052152).

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

618432408 is a wasteful number, since it uses less digits than its factorization.

618432408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1719 (or 1706 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 36.

The square root of 618432408 is about 24868.3012688845. The cubic root of 618432408 is about 851.9826419792.

The spelling of 618432408 in words is "six hundred eighteen million, four hundred thirty-two thousand, four hundred eight".