77742217 has 8 divisors (see below), whose sum is σ = 91249856. Its totient is φ = 64834992.

The previous prime is 77742211. The next prime is 77742229. The reversal of 77742217 is 71224777.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77742217 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77742211) 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, 149823 + ... + 150340.

It is an arithmetic number, because the mean of its divisors is an integer number (11406232).

Almost surely, 2^77742217 is an apocalyptic number.

It is an amenable number.

77742217 is a deficient number, since it is larger than the sum of its proper divisors (13507639).

77742217 is a wasteful number, since it uses less digits than its factorization.

77742217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300207.

The product of its digits is 38416, while the sum is 37.

The square root of 77742217 is about 8817.1546997884. The cubic root of 77742217 is about 426.7946569010.

The spelling of 77742217 in words is "seventy-seven million, seven hundred forty-two thousand, two hundred seventeen".