1631742690 has 16 divisors (see below), whose sum is σ = 3916182528. Its totient is φ = 435131376.

The previous prime is 1631742683. The next prime is 1631742701. The reversal of 1631742690 is 962471361.

It is a super-2 number, since 2×1631742690² = 5325168412736872200, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27195682 + ... + 27195741.

It is an arithmetic number, because the mean of its divisors is an integer number (244761408).

Almost surely, 2^1631742690 is an apocalyptic number.

1631742690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1631742690 is an abundant number, since it is smaller than the sum of its proper divisors (2284439838).

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

1631742690 is a wasteful number, since it uses less digits than its factorization.

1631742690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54391433.

The product of its (nonzero) digits is 54432, while the sum is 39.

The square root of 1631742690 is about 40394.8349421062. The cubic root of 1631742690 is about 1177.2911841611.

The spelling of 1631742690 in words is "one billion, six hundred thirty-one million, seven hundred forty-two thousand, six hundred ninety".