611659840 has 84 divisors (see below), whose sum is σ = 1601064108. Its totient is φ = 222407680.

The previous prime is 611659823. The next prime is 611659849. The reversal of 611659840 is 48956116.

It can be written as a sum of positive squares in 2 ways, for example, as 335036416 + 276623424 = 18304^2 + 16632^2 .

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 611659793 and 611659802.

It is not an unprimeable number, because it can be changed into a prime (611659849) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30822 + ... + 46618.

It is an arithmetic number, because the mean of its divisors is an integer number (19060287).

Almost surely, 2^611659840 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 611659840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (800532054).

611659840 is an abundant number, since it is smaller than the sum of its proper divisors (989404268).

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

611659840 is a wasteful number, since it uses less digits than its factorization.

611659840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15836 (or 15815 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 40.

The square root of 611659840 is about 24731.7577216016. The cubic root of 611659840 is about 848.8611460932.

It can be divided in two parts, 6116 and 59840, that added together give a palindrome (65956).

The spelling of 611659840 in words is "six hundred eleven million, six hundred fifty-nine thousand, eight hundred forty".