31425072 has 120 divisors (see below), whose sum is σ = 97708032. Its totient is φ = 8668800.

The previous prime is 31425071. The next prime is 31425083. The reversal of 31425072 is 27052413.

It is a hoax number, since the sum of its digits (24) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (31425071) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 72697 + ... + 73127.

Almost surely, 2^31425072 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 31425072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48854016).

31425072 is an abundant number, since it is smaller than the sum of its proper divisors (66282960).

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

31425072 is a wasteful number, since it uses less digits than its factorization.

31425072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 487 (or 474 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 24.

The square root of 31425072 is about 5605.8069891854. The cubic root of 31425072 is about 315.5673725067.

Adding to 31425072 its reverse (27052413), we get a palindrome (58477485).

The spelling of 31425072 in words is "thirty-one million, four hundred twenty-five thousand, seventy-two".