774978906 has 48 divisors (see below), whose sum is σ = 1684156320. Its totient is φ = 237631680.

The previous prime is 774978899. The next prime is 774978907. The reversal of 774978906 is 609879477.

It is not an unprimeable number, because it can be changed into a prime (774978907) 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, 334480 + ... + 336788.

It is an arithmetic number, because the mean of its divisors is an integer number (35086590).

Almost surely, 2^774978906 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 774978906, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (842078160).

774978906 is an abundant number, since it is smaller than the sum of its proper divisors (909177414).

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

774978906 is a wasteful number, since it uses less digits than its factorization.

774978906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2671 (or 2658 counting only the distinct ones).

The product of its (nonzero) digits is 5334336, while the sum is 57.

The square root of 774978906 is about 27838.4429521480. The cubic root of 774978906 is about 918.5369412567.

The spelling of 774978906 in words is "seven hundred seventy-four million, nine hundred seventy-eight thousand, nine hundred six".