87780249 has 12 divisors (see below), whose sum is σ = 126974016. Its totient is φ = 58436952.

The previous prime is 87780223. The next prime is 87780263. The reversal of 87780249 is 94208778.

It is not a de Polignac number, because 87780249 - 2⁹ = 87779737 is a prime.

It is a super-2 number, since 2×87780249² = 15410744229004002, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (87780269) 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, 124 + ... + 13250.

It is an arithmetic number, because the mean of its divisors is an integer number (10581168).

Almost surely, 2^87780249 is an apocalyptic number.

It is an amenable number.

87780249 is a deficient number, since it is larger than the sum of its proper divisors (39193767).

87780249 is a wasteful number, since it uses less digits than its factorization.

87780249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13876 (or 13873 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 45.

The square root of 87780249 is about 9369.1114306534. Note that the first 3 decimals coincide. The cubic root of 87780249 is about 444.4254656734.

The spelling of 87780249 in words is "eighty-seven million, seven hundred eighty thousand, two hundred forty-nine".