31400028 has 48 divisors (see below), whose sum is σ = 88811520. Its totient is φ = 9514800.

The previous prime is 31400023. The next prime is 31400029. The reversal of 31400028 is 82000413.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31400021) 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 15 ways as a sum of consecutive naturals, for example, 12028 + ... + 14403.

It is an arithmetic number, because the mean of its divisors is an integer number (1850240).

Almost surely, 2^31400028 is an apocalyptic number.

It is an amenable number.

31400028 is an abundant number, since it is smaller than the sum of its proper divisors (57411492).

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

31400028 is a wasteful number, since it uses less digits than its factorization.

31400028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26455 (or 26447 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 31400028 is about 5603.5727888553. The cubic root of 31400028 is about 315.4835204619.

It can be divided in two parts, 314000 and 28, that added together give a triangular number (314028 = T₇₉₂).

The spelling of 31400028 in words is "thirty-one million, four hundred thousand, twenty-eight".