30798540 has 36 divisors (see below), whose sum is σ = 93422784. Its totient is φ = 8212896.

The previous prime is 30798517. The next prime is 30798553. The reversal of 30798540 is 4589703.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×30798540² = 1897100132263200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 30798495 and 30798504.

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, 85372 + ... + 85731.

Almost surely, 2^30798540 is an apocalyptic number.

30798540 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

30798540 is an abundant number, since it is smaller than the sum of its proper divisors (62624244).

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

30798540 is a wasteful number, since it uses less digits than its factorization.

30798540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171118 (or 171113 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 30798540 is about 5549.6432317763. The cubic root of 30798540 is about 313.4560884140.

It can be divided in two parts, 307985 and 40, that added together give a square (308025 = 555²).

The spelling of 30798540 in words is "thirty million, seven hundred ninety-eight thousand, five hundred forty".