31272690 has 48 divisors (see below), whose sum is σ = 79751232. Its totient is φ = 7846656.

The previous prime is 31272679. The next prime is 31272721. The reversal of 31272690 is 9627213.

It is a super-2 number, since 2×31272690² = 1955962279672200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6867 + ... + 10473.

It is an arithmetic number, because the mean of its divisors is an integer number (1661484).

Almost surely, 2^31272690 is an apocalyptic number.

31272690 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 31272690, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39875616).

31272690 is an abundant number, since it is smaller than the sum of its proper divisors (48478542).

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

31272690 is a wasteful number, since it uses less digits than its factorization.

31272690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3651 (or 3634 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 30.

The square root of 31272690 is about 5592.1990307928. The cubic root of 31272690 is about 315.0564776536.

The spelling of 31272690 in words is "thirty-one million, two hundred seventy-two thousand, six hundred ninety".