631548090 has 60 divisors (see below), whose sum is σ = 1700087994. Its totient is φ = 168222096.

The previous prime is 631548083. The next prime is 631548101. The reversal of 631548090 is 90845136.

It can be written as a sum of positive squares in only one way, i.e., 568393281 + 63154809 = 23841^2 + 7947^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 714789 + ... + 715671.

Almost surely, 2^631548090 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 631548090, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (850043997).

631548090 is an abundant number, since it is smaller than the sum of its proper divisors (1068539904).

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

631548090 is an frugal number, since it uses more digits than its factorization.

631548090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1785 (or 893 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 631548090 is about 25130.6205653581. The cubic root of 631548090 is about 857.9634929941.

The spelling of 631548090 in words is "six hundred thirty-one million, five hundred forty-eight thousand, ninety".