30640533 has 32 divisors (see below), whose sum is σ = 51993600. Its totient is φ = 15911280.

The previous prime is 30640523. The next prime is 30640537. The reversal of 30640533 is 33504603.

It is not a de Polignac number, because 30640533 - 2⁶ = 30640469 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30640537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9966 + ... + 12672.

It is an arithmetic number, because the mean of its divisors is an integer number (1624800).

Almost surely, 2^30640533 is an apocalyptic number.

30640533 is a gapful number since it is divisible by the number (33) formed by its first and last digit.

It is an amenable number.

30640533 is a deficient number, since it is larger than the sum of its proper divisors (21353067).

30640533 is a wasteful number, since it uses less digits than its factorization.

30640533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2742 (or 2728 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 24.

The square root of 30640533 is about 5535.3891462119. The cubic root of 30640533 is about 312.9191235953.

The spelling of 30640533 in words is "thirty million, six hundred forty thousand, five hundred thirty-three".