30764981 has 4 divisors (see below), whose sum is σ = 33131532. Its totient is φ = 28398432.

The previous prime is 30764977. The next prime is 30764983. The reversal of 30764981 is 18946703.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4036081 + 26728900 = 2009^2 + 5170^2 .

It is a cyclic number.

It is not a de Polignac number, because 30764981 - 2² = 30764977 is a prime.

It is a super-2 number, since 2×30764981² = 1892968111860722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30764983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1183256 + ... + 1183281.

It is an arithmetic number, because the mean of its divisors is an integer number (8282883).

Almost surely, 2^30764981 is an apocalyptic number.

It is an amenable number.

30764981 is a deficient number, since it is larger than the sum of its proper divisors (2366551).

30764981 is a wasteful number, since it uses less digits than its factorization.

30764981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2366550.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 30764981 is about 5546.6188800025. The cubic root of 30764981 is about 313.3421966961.

The spelling of 30764981 in words is "thirty million, seven hundred sixty-four thousand, nine hundred eighty-one".