77574242 has 4 divisors (see below), whose sum is σ = 116361366. Its totient is φ = 38787120.

The previous prime is 77574241. The next prime is 77574257. The reversal of 77574242 is 24247577.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24247577 = 139 ⋅174443.

It can be written as a sum of positive squares in only one way, i.e., 75672601 + 1901641 = 8699^2 + 1379^2 .

It is a junction number, because it is equal to n+sod(n) for n = 77574196 and 77574205.

It is not an unprimeable number, because it can be changed into a prime (77574241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19393559 + ... + 19393562.

Almost surely, 2^77574242 is an apocalyptic number.

77574242 is a deficient number, since it is larger than the sum of its proper divisors (38787124).

77574242 is a wasteful number, since it uses less digits than its factorization.

77574242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38787123.

The product of its digits is 109760, while the sum is 38.

The square root of 77574242 is about 8807.6240837129. The cubic root of 77574242 is about 426.4870482826.

The spelling of 77574242 in words is "seventy-seven million, five hundred seventy-four thousand, two hundred forty-two".