77242273 has 8 divisors (see below), whose sum is σ = 79841192. Its totient is φ = 74670336.

The previous prime is 77242241. The next prime is 77242279. The reversal of 77242273 is 37224277.

It can be written as a sum of positive squares in 4 ways, for example, as 1760929 + 75481344 = 1327^2 + 8688^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 77242273 - 2⁵ = 77242241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77242279) 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, 840 + ... + 12457.

It is an arithmetic number, because the mean of its divisors is an integer number (9980149).

Almost surely, 2^77242273 is an apocalyptic number.

It is an amenable number.

77242273 is a deficient number, since it is larger than the sum of its proper divisors (2598919).

77242273 is a wasteful number, since it uses less digits than its factorization.

77242273 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13491.

The product of its digits is 32928, while the sum is 34.

The square root of 77242273 is about 8788.7583309589. The cubic root of 77242273 is about 425.8778129003.

The spelling of 77242273 in words is "seventy-seven million, two hundred forty-two thousand, two hundred seventy-three".