31061328 has 20 divisors (see below), whose sum is σ = 80241888. Its totient is φ = 10353760.

The previous prime is 31061321. The next prime is 31061353. The reversal of 31061328 is 82316013.

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

It is a junction number, because it is equal to n+sod(n) for n = 31061298 and 31061307.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31061321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 323508 + ... + 323603.

Almost surely, 2^31061328 is an apocalyptic number.

It is an amenable number.

31061328 is an abundant number, since it is smaller than the sum of its proper divisors (49180560).

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

31061328 is a wasteful number, since it uses less digits than its factorization.

31061328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 647122 (or 647116 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 31061328 is about 5573.2690586405. The cubic root of 31061328 is about 314.3450842583.

The spelling of 31061328 in words is "thirty-one million, sixty-one thousand, three hundred twenty-eight".