122781770 has 16 divisors (see below), whose sum is σ = 226147680. Its totient is φ = 47970384.

The previous prime is 122781767. The next prime is 122781779. The reversal of 122781770 is 77187221.

It is a self number, because there is not a number n which added to its sum of digits gives 122781770.

It is not an unprimeable number, because it can be changed into a prime (122781779) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 142340 + ... + 143199.

It is an arithmetic number, because the mean of its divisors is an integer number (14134230).

Almost surely, 2^122781770 is an apocalyptic number.

122781770 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

122781770 is a deficient number, since it is larger than the sum of its proper divisors (103365910).

122781770 is a wasteful number, since it uses less digits than its factorization.

122781770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285589.

The product of its (nonzero) digits is 10976, while the sum is 35.

The square root of 122781770 is about 11080.6935703502. The cubic root of 122781770 is about 497.0246901814.

The spelling of 122781770 in words is "one hundred twenty-two million, seven hundred eighty-one thousand, seven hundred seventy".