77442861 has 8 divisors (see below), whose sum is σ = 104279904. Its totient is φ = 51117200.

The previous prime is 77442851. The next prime is 77442907. The reversal of 77442861 is 16824477.

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 77442861 - 2¹⁴ = 77426477 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77442811) 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, 127491 + ... + 128096.

It is an arithmetic number, because the mean of its divisors is an integer number (13034988).

Almost surely, 2^77442861 is an apocalyptic number.

It is an amenable number.

77442861 is a deficient number, since it is larger than the sum of its proper divisors (26837043).

77442861 is a wasteful number, since it uses less digits than its factorization.

77442861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255691.

The product of its digits is 75264, while the sum is 39.

The square root of 77442861 is about 8800.1625553168. The cubic root of 77442861 is about 426.2461437605.

The spelling of 77442861 in words is "seventy-seven million, four hundred forty-two thousand, eight hundred sixty-one".