30420858 has 64 divisors (see below), whose sum is σ = 70705152. Its totient is φ = 8648640.

The previous prime is 30420857. The next prime is 30420877. The reversal of 30420858 is 85802403.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (30420857) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 55341 + ... + 55887.

It is an arithmetic number, because the mean of its divisors is an integer number (1104768).

Almost surely, 2^30420858 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30420858, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35352576).

30420858 is an abundant number, since it is smaller than the sum of its proper divisors (40284294).

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

30420858 is a wasteful number, since it uses less digits than its factorization.

30420858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 619.

The product of its (nonzero) digits is 7680, while the sum is 30.

The square root of 30420858 is about 5515.5106744525. The cubic root of 30420858 is about 312.1695125864.

The spelling of 30420858 in words is "thirty million, four hundred twenty thousand, eight hundred fifty-eight".