30421878 has 32 divisors (see below), whose sum is σ = 62539776. Its totient is φ = 9860928.

The previous prime is 30421871. The next prime is 30421901. The reversal of 30421878 is 87812403.

It is a super-2 number, since 2×30421878² = 1850981322093768, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30421871) 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 15 ways as a sum of consecutive naturals, for example, 65475 + ... + 65937.

It is an arithmetic number, because the mean of its divisors is an integer number (1954368).

Almost surely, 2^30421878 is an apocalyptic number.

30421878 is an abundant number, since it is smaller than the sum of its proper divisors (32117898).

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

30421878 is a wasteful number, since it uses less digits than its factorization.

30421878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 748.

The product of its (nonzero) digits is 10752, while the sum is 33.

The square root of 30421878 is about 5515.6031401833. The cubic root of 30421878 is about 312.1730015231.

The spelling of 30421878 in words is "thirty million, four hundred twenty-one thousand, eight hundred seventy-eight".