87249969 has 12 divisors (see below), whose sum is σ = 126365200. Its totient is φ = 58010904.

The previous prime is 87249949. The next prime is 87249979. The reversal of 87249969 is 96994278.

It is not a de Polignac number, because 87249969 - 2⁵ = 87249937 is a prime.

It is a super-2 number, since 2×87249969² = 15225114181001922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (87249949) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9379 + ... + 16200.

Almost surely, 2^87249969 is an apocalyptic number.

It is an amenable number.

87249969 is a deficient number, since it is larger than the sum of its proper divisors (39115231).

87249969 is a wasteful number, since it uses less digits than its factorization.

87249969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25964 (or 25961 counting only the distinct ones).

The product of its digits is 1959552, while the sum is 54.

The square root of 87249969 is about 9340.7691867426. The cubic root of 87249969 is about 443.5287335952.

The spelling of 87249969 in words is "eighty-seven million, two hundred forty-nine thousand, nine hundred sixty-nine".