31087420 has 192 divisors, whose sum is σ = 90316800. Its totient is φ = 8709120.

The previous prime is 31087411. The next prime is 31087429. The reversal of 31087420 is 2478013.

It is an interprime number because it is at equal distance from previous prime (31087411) and next prime (31087429).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31087429) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1002805 + ... + 1002835.

It is an arithmetic number, because the mean of its divisors is an integer number (470400).

Almost surely, 2^31087420 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 31087420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45158400).

31087420 is an abundant number, since it is smaller than the sum of its proper divisors (59229380).

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

31087420 is a wasteful number, since it uses less digits than its factorization.

31087420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108 (or 106 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 31087420 is about 5575.6093837356. The cubic root of 31087420 is about 314.4330778821.

The spelling of 31087420 in words is "thirty-one million, eighty-seven thousand, four hundred twenty".