247528989 has 6 divisors (see below), whose sum is σ = 357541886. Its totient is φ = 165019320.

The previous prime is 247528973. The next prime is 247529003. The reversal of 247528989 is 989825742.

247528989 is a `hidden beast` number, since 24 + 7 + 528 + 98 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 133402500 + 114126489 = 11550^2 + 10683^2 .

It is not a de Polignac number, because 247528989 - 2⁴ = 247528973 is a prime.

It is a super-2 number, since 2×247528989² = 122541200790724242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (247528909) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13751602 + ... + 13751619.

Almost surely, 2^247528989 is an apocalyptic number.

It is an amenable number.

247528989 is a deficient number, since it is larger than the sum of its proper divisors (110012897).

247528989 is a wasteful number, since it uses less digits than its factorization.

247528989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27503227 (or 27503224 counting only the distinct ones).

The product of its digits is 2903040, while the sum is 54.

The square root of 247528989 is about 15733.0540264756. The cubic root of 247528989 is about 627.8781297923.

The spelling of 247528989 in words is "two hundred forty-seven million, five hundred twenty-eight thousand, nine hundred eighty-nine".