31428684 has 36 divisors (see below), whose sum is σ = 90794704. Its totient is φ = 8979552.

The previous prime is 31428611. The next prime is 31428689. The reversal of 31428684 is 48682413.

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 (31428689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 62107 + ... + 62610.

Almost surely, 2^31428684 is an apocalyptic number.

It is an amenable number.

31428684 is an abundant number, since it is smaller than the sum of its proper divisors (59366020).

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

31428684 is a wasteful number, since it uses less digits than its factorization.

31428684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124734 (or 124729 counting only the distinct ones).

The product of its digits is 36864, while the sum is 36.

The square root of 31428684 is about 5606.1291458546. The cubic root of 31428684 is about 315.5794624889.

The spelling of 31428684 in words is "thirty-one million, four hundred twenty-eight thousand, six hundred eighty-four".