156778842 has 128 divisors (see below), whose sum is σ = 385228800. Its totient is φ = 41990400.

The previous prime is 156778837. The next prime is 156778847. The reversal of 156778842 is 248877651.

It is an interprime number because it is at equal distance from previous prime (156778837) and next prime (156778847).

It is a junction number, because it is equal to n+sod(n) for n = 156778791 and 156778800.

It is not an unprimeable number, because it can be changed into a prime (156778847) 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 63 ways as a sum of consecutive naturals, for example, 1438284 + ... + 1438392.

It is an arithmetic number, because the mean of its divisors is an integer number (3009600).

Almost surely, 2^156778842 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 156778842, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (192614400).

156778842 is an abundant number, since it is smaller than the sum of its proper divisors (228449958).

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

156778842 is a wasteful number, since it uses less digits than its factorization.

156778842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212.

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

The square root of 156778842 is about 12521.1358110996. The cubic root of 156778842 is about 539.2156445321.

The spelling of 156778842 in words is "one hundred fifty-six million, seven hundred seventy-eight thousand, eight hundred forty-two".