30640491 has 16 divisors (see below), whose sum is σ = 51878400. Its totient is φ = 17508744.

The previous prime is 30640481. The next prime is 30640513. The reversal of 30640491 is 19404603.

It is not a de Polignac number, because 30640491 - 2¹³ = 30632299 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (30640481) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80871 + ... + 81248.

It is an arithmetic number, because the mean of its divisors is an integer number (3242400).

Almost surely, 2^30640491 is an apocalyptic number.

30640491 is a deficient number, since it is larger than the sum of its proper divisors (21237909).

30640491 is a wasteful number, since it uses less digits than its factorization.

30640491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162135 (or 162129 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 30640491 is about 5535.3853524393. The cubic root of 30640491 is about 312.9189806191.

It can be divided in two parts, 3064049 and 1, that added together give a triangular number (3064050 = T₂₄₇₅).

The spelling of 30640491 in words is "thirty million, six hundred forty thousand, four hundred ninety-one".