249555620 has 24 divisors (see below), whose sum is σ = 524517504. Its totient is φ = 99736416.

The previous prime is 249555613. The next prime is 249555629. The reversal of 249555620 is 26555942.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (249555629) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21839 + ... + 31241.

It is an arithmetic number, because the mean of its divisors is an integer number (21854896).

Almost surely, 2^249555620 is an apocalyptic number.

249555620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

249555620 is an abundant number, since it is smaller than the sum of its proper divisors (274961884).

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

249555620 is a wasteful number, since it uses less digits than its factorization.

249555620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10739 (or 10737 counting only the distinct ones).

The product of its (nonzero) digits is 108000, while the sum is 38.

The square root of 249555620 is about 15797.3295211564. The cubic root of 249555620 is about 629.5870477615.

The spelling of 249555620 in words is "two hundred forty-nine million, five hundred fifty-five thousand, six hundred twenty".