31296428 has 6 divisors (see below), whose sum is σ = 54768756. Its totient is φ = 15648212.

The previous prime is 31296427. The next prime is 31296431. The reversal of 31296428 is 82469213.

It is not an unprimeable number, because it can be changed into a prime (31296427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3912050 + ... + 3912057.

It is an arithmetic number, because the mean of its divisors is an integer number (9128126).

Almost surely, 2^31296428 is an apocalyptic number.

It is an amenable number.

31296428 is a deficient number, since it is larger than the sum of its proper divisors (23472328).

31296428 is a wasteful number, since it uses less digits than its factorization.

31296428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7824111 (or 7824109 counting only the distinct ones).

The product of its digits is 20736, while the sum is 35.

The square root of 31296428 is about 5594.3210490640. The cubic root of 31296428 is about 315.1361735924.

The spelling of 31296428 in words is "thirty-one million, two hundred ninety-six thousand, four hundred twenty-eight".