31203428 has 12 divisors (see below), whose sum is σ = 54742380. Its totient is φ = 15562752.

The previous prime is 31203427. The next prime is 31203443. The reversal of 31203428 is 82430213.

It can be written as a sum of positive squares in 2 ways, for example, as 12730624 + 18472804 = 3568^2 + 4298^2 .

It is a super-3 number, since 3×31203428³ (a number of 23 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (31203427) 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, 7901 + ... + 11172.

It is an arithmetic number, because the mean of its divisors is an integer number (4561865).

Almost surely, 2^31203428 is an apocalyptic number.

It is an amenable number.

31203428 is a deficient number, since it is larger than the sum of its proper divisors (23538952).

31203428 is a wasteful number, since it uses less digits than its factorization.

31203428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19486 (or 19484 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 31203428 is about 5586.0028643029. The cubic root of 31203428 is about 314.8237125639.

The spelling of 31203428 in words is "thirty-one million, two hundred three thousand, four hundred twenty-eight".