77242285 has 4 divisors (see below), whose sum is σ = 92690748. Its totient is φ = 61793824.

The previous prime is 77242279. The next prime is 77242301. The reversal of 77242285 is 58224277.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58224277 = 1451 ⋅40127.

It can be written as a sum of positive squares in 2 ways, for example, as 41744521 + 35497764 = 6461^2 + 5958^2 .

It is a cyclic number.

It is not a de Polignac number, because 77242285 - 2⁷ = 77242157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7724224 + ... + 7724233.

It is an arithmetic number, because the mean of its divisors is an integer number (23172687).

Almost surely, 2^77242285 is an apocalyptic number.

It is an amenable number.

77242285 is a deficient number, since it is larger than the sum of its proper divisors (15448463).

77242285 is a wasteful number, since it uses less digits than its factorization.

77242285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15448462.

The product of its digits is 62720, while the sum is 37.

The square root of 77242285 is about 8788.7590136492. The cubic root of 77242285 is about 425.8778349544.

The spelling of 77242285 in words is "seventy-seven million, two hundred forty-two thousand, two hundred eighty-five".