77442971 has 4 divisors (see below), whose sum is σ = 77496744. Its totient is φ = 77389200.

The previous prime is 77442943. The next prime is 77442979. The reversal of 77442971 is 17924477.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17924477 = 17 ⋅1054381.

It is a cyclic number.

It is not a de Polignac number, because 77442971 - 2⁶ = 77442907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77442979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24665 + ... + 27626.

It is an arithmetic number, because the mean of its divisors is an integer number (19374186).

Almost surely, 2^77442971 is an apocalyptic number.

77442971 is a deficient number, since it is larger than the sum of its proper divisors (53773).

77442971 is a wasteful number, since it uses less digits than its factorization.

77442971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53772.

The product of its digits is 98784, while the sum is 41.

The square root of 77442971 is about 8800.1688051991. The cubic root of 77442971 is about 426.2463455740.

The spelling of 77442971 in words is "seventy-seven million, four hundred forty-two thousand, nine hundred seventy-one".