631273890 has 64 divisors (see below), whose sum is σ = 1638838656. Its totient is φ = 154701312.

The previous prime is 631273889. The next prime is 631273891. The reversal of 631273890 is 98372136.

It is an interprime number because it is at equal distance from previous prime (631273889) and next prime (631273891).

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (631273891) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 87397 + ... + 94343.

It is an arithmetic number, because the mean of its divisors is an integer number (25606854).

Almost surely, 2^631273890 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 631273890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (819419328).

631273890 is an abundant number, since it is smaller than the sum of its proper divisors (1007564766).

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

631273890 is a wasteful number, since it uses less digits than its factorization.

631273890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7203.

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

The square root of 631273890 is about 25125.1644770736. The cubic root of 631273890 is about 857.8393073364.

The spelling of 631273890 in words is "six hundred thirty-one million, two hundred seventy-three thousand, eight hundred ninety".