1631388680 has 64 divisors (see below), whose sum is σ = 3926769840. Its totient is φ = 607813632.

The previous prime is 1631388677. The next prime is 1631388709. The reversal of 1631388680 is 868831361.

It can be written as a sum of positive squares in 8 ways, for example, as 455310244 + 1176078436 = 21338^2 + 34294^2 .

It is a super-2 number, since 2×1631388680² = 5322858050464284800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53594 + ... + 78326.

Almost surely, 2^1631388680 is an apocalyptic number.

1631388680 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 1631388680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1963384920).

1631388680 is an abundant number, since it is smaller than the sum of its proper divisors (2295381160).

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

1631388680 is a wasteful number, since it uses less digits than its factorization.

1631388680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24858 (or 24854 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 44.

The square root of 1631388680 is about 40390.4528323217. The cubic root of 1631388680 is about 1177.2060394059.

The spelling of 1631388680 in words is "one billion, six hundred thirty-one million, three hundred eighty-eight thousand, six hundred eighty".