30772821 has 16 divisors (see below), whose sum is σ = 42292800. Its totient is φ = 19891200.

The previous prime is 30772811. The next prime is 30772871. The reversal of 30772821 is 12827703.

It is not a de Polignac number, because 30772821 - 2⁶ = 30772757 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30772811) 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, 18421 + ... + 20021.

It is an arithmetic number, because the mean of its divisors is an integer number (2643300).

Almost surely, 2^30772821 is an apocalyptic number.

It is an amenable number.

30772821 is a deficient number, since it is larger than the sum of its proper divisors (11519979).

30772821 is a wasteful number, since it uses less digits than its factorization.

30772821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1796.

The product of its (nonzero) digits is 4704, while the sum is 30.

The square root of 30772821 is about 5547.3255718409. The cubic root of 30772821 is about 313.3688113090.

The spelling of 30772821 in words is "thirty million, seven hundred seventy-two thousand, eight hundred twenty-one".