77243971 has 16 divisors (see below), whose sum is σ = 96491520. Its totient is φ = 60301440.

The previous prime is 77243951. The next prime is 77243977. The reversal of 77243971 is 17934277.

It is a cyclic number.

It is not a de Polignac number, because 77243971 - 2²³ = 68855363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77243977) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6781 + ... + 14158.

It is an arithmetic number, because the mean of its divisors is an integer number (6030720).

Almost surely, 2^77243971 is an apocalyptic number.

77243971 is a deficient number, since it is larger than the sum of its proper divisors (19247549).

77243971 is a wasteful number, since it uses less digits than its factorization.

77243971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20994.

The product of its digits is 74088, while the sum is 40.

The square root of 77243971 is about 8788.8549311045. The cubic root of 77243971 is about 425.8809335370.

The spelling of 77243971 in words is "seventy-seven million, two hundred forty-three thousand, nine hundred seventy-one".