249687028 has 12 divisors (see below), whose sum is σ = 445197060. Its totient is φ = 122487872.

The previous prime is 249687023. The next prime is 249687047. The reversal of 249687028 is 820786942.

It can be written as a sum of positive squares in 2 ways, for example, as 175244644 + 74442384 = 13238^2 + 8628^2 .

It is a super-2 number, since 2×249687028² = 124687223902945568, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (249687023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 588673 + ... + 589096.

It is an arithmetic number, because the mean of its divisors is an integer number (37099755).

Almost surely, 2^249687028 is an apocalyptic number.

It is an amenable number.

249687028 is a deficient number, since it is larger than the sum of its proper divisors (195510032).

249687028 is a wasteful number, since it uses less digits than its factorization.

249687028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1177826 (or 1177824 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 46.

The square root of 249687028 is about 15801.4881577654. The cubic root of 249687028 is about 629.6975351651.

The spelling of 249687028 in words is "two hundred forty-nine million, six hundred eighty-seven thousand, twenty-eight".