31241028 has 144 divisors (see below), whose sum is σ = 94202304. Its totient is φ = 7983360.

The previous prime is 31241003. The next prime is 31241029. The reversal of 31241028 is 82014213.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 31240995 and 31241013.

It is not an unprimeable number, because it can be changed into a prime (31241029) 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 47 ways as a sum of consecutive naturals, for example, 466251 + ... + 466317.

Almost surely, 2^31241028 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 31241028, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47101152).

31241028 is an abundant number, since it is smaller than the sum of its proper divisors (62961276).

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

31241028 is a wasteful number, since it uses less digits than its factorization.

31241028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162 (or 153 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 31241028 is about 5589.3674060666. The cubic root of 31241028 is about 314.9501155573.

The spelling of 31241028 in words is "thirty-one million, two hundred forty-one thousand, twenty-eight".