612635640 has 128 divisors (see below), whose sum is σ = 1948907520. Its totient is φ = 153792000.

The previous prime is 612635633. The next prime is 612635651. The reversal of 612635640 is 46536216.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 135415 + ... + 139865.

It is an arithmetic number, because the mean of its divisors is an integer number (15225840).

Almost surely, 2^612635640 is an apocalyptic number.

612635640 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 612635640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (974453760).

612635640 is an abundant number, since it is smaller than the sum of its proper divisors (1336271880).

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

612635640 is a wasteful number, since it uses less digits than its factorization.

612635640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4533 (or 4529 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 33.

The square root of 612635640 is about 24751.4775316545. The cubic root of 612635640 is about 849.3123111370.

The spelling of 612635640 in words is "six hundred twelve million, six hundred thirty-five thousand, six hundred forty".