249687347420 has 24 divisors (see below), whose sum is σ = 599249634144. Its totient is φ = 85607090496.

The previous prime is 249687347417. The next prime is 249687347449. The reversal of 249687347420 is 24743786942.

It is a Smith number, since the sum of its digits (56) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 891740387 + ... + 891740666.

It is an arithmetic number, because the mean of its divisors is an integer number (24968734756).

Almost surely, 2^249687347420 is an apocalyptic number.

249687347420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

249687347420 is an abundant number, since it is smaller than the sum of its proper divisors (349562286724).

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

249687347420 is a wasteful number, since it uses less digits than its factorization.

249687347420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1783481069 (or 1783481067 counting only the distinct ones).

The product of its (nonzero) digits is 16257024, while the sum is 56.

The spelling of 249687347420 in words is "two hundred forty-nine billion, six hundred eighty-seven million, three hundred forty-seven thousand, four hundred twenty".