225072978 has 16 divisors (see below), whose sum is σ = 484772736. Its totient is φ = 69253200.

The previous prime is 225072977. The next prime is 225073001. The reversal of 225072978 is 879270522.

It is a happy number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (225072971) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1442698 + ... + 1442853.

It is an arithmetic number, because the mean of its divisors is an integer number (30298296).

Almost surely, 2^225072978 is an apocalyptic number.

225072978 is an abundant number, since it is smaller than the sum of its proper divisors (259699758).

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

225072978 is a wasteful number, since it uses less digits than its factorization.

225072978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2885569.

The product of its (nonzero) digits is 141120, while the sum is 42.

The square root of 225072978 is about 15002.4324027806. The cubic root of 225072978 is about 608.2859505139.

The spelling of 225072978 in words is "two hundred twenty-five million, seventy-two thousand, nine hundred seventy-eight".