5631990 has 64 divisors (see below), whose sum is σ = 16644096. Its totient is φ = 1187712.

The previous prime is 5631979. The next prime is 5631991. The reversal of 5631990 is 991365.

It is a super-2 number, since 2×5631990² = 63438622720200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5631991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1699 + ... + 3761.

It is an arithmetic number, because the mean of its divisors is an integer number (260064).

Almost surely, 2^5631990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 5631990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8322048).

5631990 is an abundant number, since it is smaller than the sum of its proper divisors (11012106).

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

5631990 is a wasteful number, since it uses less digits than its factorization.

5631990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2093.

The product of its (nonzero) digits is 7290, while the sum is 33.

The square root of 5631990 is about 2373.1814089951. The cubic root of 5631990 is about 177.9183019434.

The spelling of 5631990 in words is "five million, six hundred thirty-one thousand, nine hundred ninety".