778542 has 8 divisors (see below), whose sum is σ = 1557096. Its totient is φ = 259512.

The previous prime is 778541. The next prime is 778553. The reversal of 778542 is 245877.

It is a sphenic number, since it is the product of 3 distinct primes.

778542 is an admirable number.

It is a super-2 number, since 2×778542² = 1212255291528, which contains 22 as substring.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 778542.

It is not an unprimeable number, because it can be changed into a prime (778541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64873 + ... + 64884.

It is an arithmetic number, because the mean of its divisors is an integer number (194637).

2⁷⁷⁸⁵⁴² is an apocalyptic number.

778542 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

778542 is a wasteful number, since it uses less digits than its factorization.

778542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129762.

The product of its digits is 15680, while the sum is 33.

The square root of 778542 is about 882.3502705842. The cubic root of 778542 is about 91.9942497981.

The spelling of 778542 in words is "seven hundred seventy-eight thousand, five hundred forty-two".