778388250 has 64 divisors (see below), whose sum is σ = 1947628800. Its totient is φ = 207060800.

The previous prime is 778388227. The next prime is 778388251. The reversal of 778388250 is 52883877.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 778388250.

It is not an unprimeable number, because it can be changed into a prime (778388251) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 380731 + ... + 382769.

It is an arithmetic number, because the mean of its divisors is an integer number (30431700).

Almost surely, 2^778388250 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 778388250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (973814400).

778388250 is an abundant number, since it is smaller than the sum of its proper divisors (1169240550).

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

778388250 is a wasteful number, since it uses less digits than its factorization.

778388250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2568 (or 2558 counting only the distinct ones).

The product of its (nonzero) digits is 752640, while the sum is 48.

The square root of 778388250 is about 27899.6102123309. The cubic root of 778388250 is about 919.8819358576.

The spelling of 778388250 in words is "seven hundred seventy-eight million, three hundred eighty-eight thousand, two hundred fifty".