249487780 has 12 divisors (see below), whose sum is σ = 523924380. Its totient is φ = 99795104.

The previous prime is 249487759. The next prime is 249487807. The reversal of 249487780 is 87784942.

It can be written as a sum of positive squares in 2 ways, for example, as 145733184 + 103754596 = 12072^2 + 10186^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6237175 + ... + 6237214.

It is an arithmetic number, because the mean of its divisors is an integer number (43660365).

Almost surely, 2^249487780 is an apocalyptic number.

249487780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

249487780 is an abundant number, since it is smaller than the sum of its proper divisors (274436600).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

249487780 is a wasteful number, since it uses less digits than its factorization.

249487780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12474398 (or 12474396 counting only the distinct ones).

The product of its (nonzero) digits is 903168, while the sum is 49.

The square root of 249487780 is about 15795.1821768538. The cubic root of 249487780 is about 629.5299929372.

The spelling of 249487780 in words is "two hundred forty-nine million, four hundred eighty-seven thousand, seven hundred eighty".