30390820 has 24 divisors (see below), whose sum is σ = 66596544. Its totient is φ = 11627616.

The previous prime is 30390817. The next prime is 30390887. The reversal of 30390820 is 2809303.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32574 + ... + 33493.

It is an arithmetic number, because the mean of its divisors is an integer number (2774856).

Almost surely, 2^30390820 is an apocalyptic number.

It is an amenable number.

30390820 is an abundant number, since it is smaller than the sum of its proper divisors (36205724).

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

30390820 is a wasteful number, since it uses less digits than its factorization.

30390820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66099 (or 66097 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 30390820 is about 5512.7869539825. The cubic root of 30390820 is about 312.0667318361.

The spelling of 30390820 in words is "thirty million, three hundred ninety thousand, eight hundred twenty".