29978220 has 24 divisors (see below), whose sum is σ = 83939184. Its totient is φ = 7994176.

The previous prime is 29978213. The next prime is 29978233. The reversal of 29978220 is 2287992.

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, 249759 + ... + 249878.

It is an arithmetic number, because the mean of its divisors is an integer number (3497466).

Almost surely, 2^29978220 is an apocalyptic number.

29978220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

29978220 is an abundant number, since it is smaller than the sum of its proper divisors (53960964).

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

29978220 is a wasteful number, since it uses less digits than its factorization.

29978220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 499649 (or 499647 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 39.

The square root of 29978220 is about 5475.2369811726. The cubic root of 29978220 is about 310.6480373642.

The spelling of 29978220 in words is "twenty-nine million, nine hundred seventy-eight thousand, two hundred twenty".