30826640 has 40 divisors (see below), whose sum is σ = 77187768. Its totient is φ = 11381760.

The previous prime is 30826639. The next prime is 30826643. The reversal of 30826640 is 4662803.

It can be written as a sum of positive squares in 4 ways, for example, as 4734976 + 26091664 = 2176^2 + 5108^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (30826643) 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, 13781 + ... + 15860.

Almost surely, 2^30826640 is an apocalyptic number.

It is an amenable number.

30826640 is an abundant number, since it is smaller than the sum of its proper divisors (46361128).

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

30826640 is a wasteful number, since it uses less digits than its factorization.

30826640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29667 (or 29661 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 30826640 is about 5552.1743488475. The cubic root of 30826640 is about 313.5513898867.

The spelling of 30826640 in words is "thirty million, eight hundred twenty-six thousand, six hundred forty".