30851380 has 36 divisors (see below), whose sum is σ = 75367908. Its totient is φ = 10577280.

The previous prime is 30851371. The next prime is 30851399. The reversal of 30851380 is 8315803.

It can be written as a sum of positive squares in 2 ways, for example, as 5731236 + 25120144 = 2394^2 + 5012^2 .

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14761 + ... + 16720.

It is an arithmetic number, because the mean of its divisors is an integer number (2093553).

Almost surely, 2^30851380 is an apocalyptic number.

It is an amenable number.

30851380 is an abundant number, since it is smaller than the sum of its proper divisors (44516528).

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

30851380 is a wasteful number, since it uses less digits than its factorization.

30851380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31504 (or 31495 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 30851380 is about 5554.4018579862. The cubic root of 30851380 is about 313.6352479513.

It can be divided in two parts, 3085 and 1380, that added together give a triangular number (4465 = T₉₄).

The spelling of 30851380 in words is "thirty million, eight hundred fifty-one thousand, three hundred eighty".