609101640 has 512 divisors, whose sum is σ = 2521497600. Its totient is φ = 127733760.

The previous prime is 609101629. The next prime is 609101641. The reversal of 609101640 is 46101906.

609101640 is a `hidden beast` number, since 6 + 0 + 9 + 10 + 1 + 640 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (609101641) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 5390224 + ... + 5390336.

It is an arithmetic number, because the mean of its divisors is an integer number (4924800).

Almost surely, 2^609101640 is an apocalyptic number.

609101640 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 609101640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1260748800).

609101640 is an abundant number, since it is smaller than the sum of its proper divisors (1912395960).

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

609101640 is a wasteful number, since it uses less digits than its factorization.

609101640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194 (or 184 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 609101640 is about 24679.9846029125. The cubic root of 609101640 is about 847.6760696134.

The spelling of 609101640 in words is "six hundred nine million, one hundred one thousand, six hundred forty".