77444242 has 4 divisors (see below), whose sum is σ = 116166366. Its totient is φ = 38722120.

The previous prime is 77444221. The next prime is 77444249. The reversal of 77444242 is 24244477.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24244477 = 317 ⋅76481.

It can be written as a sum of positive squares in only one way, i.e., 60047001 + 17397241 = 7749^2 + 4171^2 .

It is a super-2 number, since 2×77444242² = 11995221237909128, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 77444198 and 77444207.

It is not an unprimeable number, because it can be changed into a prime (77444249) 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, 19361059 + ... + 19361062.

Almost surely, 2^77444242 is an apocalyptic number.

77444242 is a deficient number, since it is larger than the sum of its proper divisors (38722124).

77444242 is a wasteful number, since it uses less digits than its factorization.

77444242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38722123.

The product of its digits is 50176, while the sum is 34.

The square root of 77444242 is about 8800.2410194267. The cubic root of 77444242 is about 426.2486774239.

The spelling of 77444242 in words is "seventy-seven million, four hundred forty-four thousand, two hundred forty-two".