31428297 has 32 divisors (see below), whose sum is σ = 48048000. Its totient is φ = 20295360.

The previous prime is 31428277. The next prime is 31428307. The reversal of 31428297 is 79282413.

It is not a de Polignac number, because 31428297 - 2⁷ = 31428169 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31428277) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 173547 + ... + 173727.

It is an arithmetic number, because the mean of its divisors is an integer number (1501500).

Almost surely, 2^31428297 is an apocalyptic number.

It is an amenable number.

31428297 is a deficient number, since it is larger than the sum of its proper divisors (16619703).

31428297 is a wasteful number, since it uses less digits than its factorization.

31428297 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 358 (or 352 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 31428297 is about 5606.0946299541. The cubic root of 31428297 is about 315.5781671780.

The spelling of 31428297 in words is "thirty-one million, four hundred twenty-eight thousand, two hundred ninety-seven".