344778840 has 384 divisors, whose sum is σ = 1358622720. Its totient is φ = 74188800.

The previous prime is 344778757. The next prime is 344778877. The reversal of 344778840 is 48877443.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 4856005 + ... + 4856075.

It is an arithmetic number, because the mean of its divisors is an integer number (3538080).

Almost surely, 2^344778840 is an apocalyptic number.

344778840 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 344778840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (679311360).

344778840 is an abundant number, since it is smaller than the sum of its proper divisors (1013843880).

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

344778840 is a wasteful number, since it uses less digits than its factorization.

344778840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183 (or 176 counting only the distinct ones).

The product of its (nonzero) digits is 602112, while the sum is 45.

The square root of 344778840 is about 18568.2212395264. The cubic root of 344778840 is about 701.2080093438.

The spelling of 344778840 in words is "three hundred forty-four million, seven hundred seventy-eight thousand, eight hundred forty".