31620448 has 48 divisors (see below), whose sum is σ = 64308384. Its totient is φ = 15298560.

The previous prime is 31620443. The next prime is 31620473. The reversal of 31620448 is 84402613.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31620443) 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 7 ways as a sum of consecutive naturals, for example, 189261 + ... + 189427.

It is an arithmetic number, because the mean of its divisors is an integer number (1339758).

Almost surely, 2^31620448 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31620448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32154192).

31620448 is an abundant number, since it is smaller than the sum of its proper divisors (32687936).

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

31620448 is a wasteful number, since it uses less digits than its factorization.

31620448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335 (or 327 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 31620448 is about 5623.2062028704. The cubic root of 31620448 is about 316.2200038207.

The spelling of 31620448 in words is "thirty-one million, six hundred twenty thousand, four hundred forty-eight".