31448720 has 20 divisors (see below), whose sum is σ = 73118460. Its totient is φ = 12579456.

The previous prime is 31448719. The next prime is 31448741. The reversal of 31448720 is 2784413.

It can be written as a sum of positive squares in 2 ways, for example, as 19642624 + 11806096 = 4432^2 + 3436^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 196475 + ... + 196634.

It is an arithmetic number, because the mean of its divisors is an integer number (3655923).

Almost surely, 2^31448720 is an apocalyptic number.

It is an amenable number.

31448720 is an abundant number, since it is smaller than the sum of its proper divisors (41669740).

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

31448720 is a wasteful number, since it uses less digits than its factorization.

31448720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 393122 (or 393116 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 29.

The square root of 31448720 is about 5607.9158338905. The cubic root of 31448720 is about 315.6465095951.

The spelling of 31448720 in words is "thirty-one million, four hundred forty-eight thousand, seven hundred twenty".