87872249 has 2 divisors, whose sum is σ = 87872250. Its totient is φ = 87872248.

The previous prime is 87872243. The next prime is 87872293. The reversal of 87872249 is 94227878.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73188025 + 14684224 = 8555^2 + 3832^2 .

It is a cyclic number.

It is not a de Polignac number, because 87872249 - 2¹² = 87868153 is a prime.

It is not a weakly prime, because it can be changed into another prime (87872243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43936124 + 43936125.

It is an arithmetic number, because the mean of its divisors is an integer number (43936125).

Almost surely, 2^87872249 is an apocalyptic number.

It is an amenable number.

87872249 is a deficient number, since it is larger than the sum of its proper divisors (1).

87872249 is an equidigital number, since it uses as much as digits as its factorization.

87872249 is an evil number, because the sum of its binary digits is even.

The product of its digits is 451584, while the sum is 47.

The square root of 87872249 is about 9374.0198954344. The cubic root of 87872249 is about 444.5806747225.

The spelling of 87872249 in words is "eighty-seven million, eight hundred seventy-two thousand, two hundred forty-nine".