31728492 has 36 divisors (see below), whose sum is σ = 80601976. Its totient is φ = 10523520.

The previous prime is 31728491. The next prime is 31728509. The reversal of 31728492 is 29482713.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (31728491) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5508 + ... + 9684.

Almost surely, 2^31728492 is an apocalyptic number.

It is an amenable number.

31728492 is an abundant number, since it is smaller than the sum of its proper divisors (48873484).

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

31728492 is a wasteful number, since it uses less digits than its factorization.

31728492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4398 (or 4393 counting only the distinct ones).

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

The square root of 31728492 is about 5632.8049850851. The cubic root of 31728492 is about 316.5797587299.

It can be divided in two parts, 3172 and 8492, that added together give a square (11664 = 108²).

The spelling of 31728492 in words is "thirty-one million, seven hundred twenty-eight thousand, four hundred ninety-two".