1631660240 has 80 divisors (see below), whose sum is σ = 4375493760. Its totient is φ = 554273280.

The previous prime is 1631660203. The next prime is 1631660243. The reversal of 1631660240 is 420661361.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1631660243) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47675 + ... + 74405.

It is an arithmetic number, because the mean of its divisors is an integer number (54693672).

Almost surely, 2^1631660240 is an apocalyptic number.

1631660240 is a gapful number since it is divisible by the number (10) 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 1631660240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2187746880).

1631660240 is an abundant number, since it is smaller than the sum of its proper divisors (2743833520).

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

1631660240 is a wasteful number, since it uses less digits than its factorization.

1631660240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26860 (or 26854 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 1631660240 is about 40393.8143779465. The cubic root of 1631660240 is about 1177.2713547902.

The spelling of 1631660240 in words is "one billion, six hundred thirty-one million, six hundred sixty thousand, two hundred forty".