778536 has 48 divisors (see below), whose sum is σ = 2302560. Its totient is φ = 235680.

The previous prime is 778529. The next prime is 778537. The reversal of 778536 is 635877.

It is a super-2 number, since 2×778536² = 1212236606592, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 778536.

It is not an unprimeable number, because it can be changed into a prime (778537) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 301 + ... + 1283.

It is an arithmetic number, because the mean of its divisors is an integer number (47970).

2⁷⁷⁸⁵³⁶ 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 778536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1151280).

778536 is an abundant number, since it is smaller than the sum of its proper divisors (1524024).

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

778536 is a wasteful number, since it uses less digits than its factorization.

778536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1006 (or 999 counting only the distinct ones).

The product of its digits is 35280, while the sum is 36.

The square root of 778536 is about 882.3468705674. The cubic root of 778536 is about 91.9940134731.

The spelling of 778536 in words is "seven hundred seventy-eight thousand, five hundred thirty-six".