31061040 has 160 divisors (see below), whose sum is σ = 106707456. Its totient is φ = 7434240.

The previous prime is 31061003. The next prime is 31061047. The reversal of 31061040 is 4016013.

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

It is not an unprimeable number, because it can be changed into a prime (31061047) 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 31 ways as a sum of consecutive naturals, for example, 93675 + ... + 94005.

Almost surely, 2^31061040 is an apocalyptic number.

31061040 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 31061040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (53353728).

31061040 is an abundant number, since it is smaller than the sum of its proper divisors (75646416).

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

31061040 is a wasteful number, since it uses less digits than its factorization.

31061040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 387 (or 381 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 31061040 is about 5573.2432209621. The cubic root of 31061040 is about 314.3441127215.

Adding to 31061040 its reverse (4016013), we get a palindrome (35077053).

The spelling of 31061040 in words is "thirty-one million, sixty-one thousand, forty".