31428620 has 24 divisors (see below), whose sum is σ = 66210144. Its totient is φ = 12531456.

The previous prime is 31428611. The next prime is 31428689. The reversal of 31428620 is 2682413.

It is a self number, because there is not a number n which added to its sum of digits gives 31428620.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4409 + ... + 9071.

It is an arithmetic number, because the mean of its divisors is an integer number (2758756).

Almost surely, 2^31428620 is an apocalyptic number.

It is an amenable number.

31428620 is an abundant number, since it is smaller than the sum of its proper divisors (34781524).

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

31428620 is a wasteful number, since it uses less digits than its factorization.

31428620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5009 (or 5007 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 31428620 is about 5606.1234378133. The cubic root of 31428620 is about 315.5792482780.

It can be divided in two parts, 314 and 28620, that multiplied together give a triangular number (8986680 = T₄₂₃₉).

The spelling of 31428620 in words is "thirty-one million, four hundred twenty-eight thousand, six hundred twenty".