618578640 has 160 divisors (see below), whose sum is σ = 2160397440. Its totient is φ = 162653184.

The previous prime is 618578593. The next prime is 618578647. The reversal of 618578640 is 46875816.

It is a happy number.

618578640 is a `hidden beast` number, since 6 + 18 + 578 + 64 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (618578647) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 155719 + ... + 159641.

It is an arithmetic number, because the mean of its divisors is an integer number (13502484).

Almost surely, 2^618578640 is an apocalyptic number.

618578640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 618578640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1080198720).

618578640 is an abundant number, since it is smaller than the sum of its proper divisors (1541818800).

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

618578640 is a wasteful number, since it uses less digits than its factorization.

618578640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4018 (or 4006 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 45.

The square root of 618578640 is about 24871.2412235497. The cubic root of 618578640 is about 852.0497887984.

The spelling of 618578640 in words is "six hundred eighteen million, five hundred seventy-eight thousand, six hundred forty".