77280442 has 16 divisors (see below), whose sum is σ = 118195200. Its totient is φ = 37885600.

The previous prime is 77280433. The next prime is 77280491. The reversal of 77280442 is 24408277.

It is a junction number, because it is equal to n+sod(n) for n = 77280398 and 77280407.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66567 + ... + 67717.

It is an arithmetic number, because the mean of its divisors is an integer number (7387200).

Almost surely, 2^77280442 is an apocalyptic number.

77280442 is a deficient number, since it is larger than the sum of its proper divisors (40914758).

77280442 is a wasteful number, since it uses less digits than its factorization.

77280442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1781.

The product of its (nonzero) digits is 25088, while the sum is 34.

The square root of 77280442 is about 8790.9295299189. The cubic root of 77280442 is about 425.9479500279.

The spelling of 77280442 in words is "seventy-seven million, two hundred eighty thousand, four hundred forty-two".