31428404 has 24 divisors (see below), whose sum is σ = 64142400. Its totient is φ = 13468728.

The previous prime is 31428403. The next prime is 31428409. The reversal of 31428404 is 40482413.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31428401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10082 + ... + 12825.

It is an arithmetic number, because the mean of its divisors is an integer number (2672600).

Almost surely, 2^31428404 is an apocalyptic number.

It is an amenable number.

31428404 is an abundant number, since it is smaller than the sum of its proper divisors (32713996).

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

31428404 is a wasteful number, since it uses less digits than its factorization.

31428404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22932 (or 22916 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 26.

The square root of 31428404 is about 5606.1041731313. The cubic root of 31428404 is about 315.5785253141.

The spelling of 31428404 in words is "thirty-one million, four hundred twenty-eight thousand, four hundred four".