31342128 has 40 divisors (see below), whose sum is σ = 81953088. Its totient is φ = 10320192.

The previous prime is 31342121. The next prime is 31342139. The reversal of 31342128 is 82124313.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 31342098 and 31342107.

It is not an unprimeable number, because it can be changed into a prime (31342121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51 + ... + 7917.

Almost surely, 2^31342128 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 31342128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40976544).

31342128 is an abundant number, since it is smaller than the sum of its proper divisors (50610960).

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

31342128 is a wasteful number, since it uses less digits than its factorization.

31342128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7961 (or 7955 counting only the distinct ones).

The product of its digits is 1152, while the sum is 24.

The square root of 31342128 is about 5598.4040583009. The cubic root of 31342128 is about 315.2894894795.

The spelling of 31342128 in words is "thirty-one million, three hundred forty-two thousand, one hundred twenty-eight".