249398777808 has 120 divisors (see below), whose sum is σ = 704667565056. Its totient is φ = 82337472000.

The previous prime is 249398777767. The next prime is 249398777809. The reversal of 249398777808 is 808777893942.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (249398777809) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10979743 + ... + 11002433.

Almost surely, 2^249398777808 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 249398777808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (352333782528).

249398777808 is an abundant number, since it is smaller than the sum of its proper divisors (455268787248).

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

249398777808 is a wasteful number, since it uses less digits than its factorization.

249398777808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23433 (or 23424 counting only the distinct ones).

The product of its (nonzero) digits is 341397504, while the sum is 72.

The spelling of 249398777808 in words is "two hundred forty-nine billion, three hundred ninety-eight million, seven hundred seventy-seven thousand, eight hundred eight".