31025040 has 80 divisors (see below), whose sum is σ = 96743808. Its totient is φ = 8224768.

The previous prime is 31025039. The next prime is 31025047. The reversal of 31025040 is 4052013.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31025047) 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 15 ways as a sum of consecutive naturals, for example, 61429 + ... + 61931.

Almost surely, 2^31025040 is an apocalyptic number.

31025040 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31025040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48371904).

31025040 is an abundant number, since it is smaller than the sum of its proper divisors (65718768).

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

31025040 is a wasteful number, since it uses less digits than its factorization.

31025040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 776 (or 770 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 15.

The square root of 31025040 is about 5570.0125673108. The cubic root of 31025040 is about 314.2226233058. Note that the first 3 decimals are identical.

Adding to 31025040 its reverse (4052013), we get a palindrome (35077053).

The spelling of 31025040 in words is "thirty-one million, twenty-five thousand, forty".