31029090 has 32 divisors (see below), whose sum is σ = 78390720. Its totient is φ = 7838784.

The previous prime is 31029083. The next prime is 31029091. The reversal of 31029090 is 9092013.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 31029090.

It is not an unprimeable number, because it can be changed into a prime (31029091) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26649 + ... + 27788.

It is an arithmetic number, because the mean of its divisors is an integer number (2449710).

Almost surely, 2^31029090 is an apocalyptic number.

31029090 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

31029090 is an abundant number, since it is smaller than the sum of its proper divisors (47361630).

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

31029090 is a wasteful number, since it uses less digits than its factorization.

31029090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54466.

The product of its (nonzero) digits is 486, while the sum is 24.

The square root of 31029090 is about 5570.3761093844. The cubic root of 31029090 is about 314.2362955552.

The spelling of 31029090 in words is "thirty-one million, twenty-nine thousand, ninety".