29978225 has 12 divisors (see below), whose sum is σ = 39360204. Its totient is φ = 22571520.

The previous prime is 29978213. The next prime is 29978233. The reversal of 29978225 is 52287992.

It can be written as a sum of positive squares in 6 ways, for example, as 2436721 + 27541504 = 1561^2 + 5248^2 .

It is not a de Polignac number, because 29978225 - 2¹⁰ = 29977201 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 34844 + ... + 35693.

It is an arithmetic number, because the mean of its divisors is an integer number (3280017).

Almost surely, 2^29978225 is an apocalyptic number.

29978225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

29978225 is a deficient number, since it is larger than the sum of its proper divisors (9381979).

29978225 is a wasteful number, since it uses less digits than its factorization.

29978225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70564 (or 70559 counting only the distinct ones).

The product of its digits is 181440, while the sum is 44.

The square root of 29978225 is about 5475.2374377738. The cubic root of 29978225 is about 310.6480546350.

It can be divided in two parts, 29978 and 225, that added together give a palindrome (30203).

The spelling of 29978225 in words is "twenty-nine million, nine hundred seventy-eight thousand, two hundred twenty-five".