77740861 has 8 divisors (see below), whose sum is σ = 86781024. Its totient is φ = 69029520.

The previous prime is 77740853. The next prime is 77740903. The reversal of 77740861 is 16804777.

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 77740861 - 2³ = 77740853 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77740801) 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, 81706 + ... + 82651.

It is an arithmetic number, because the mean of its divisors is an integer number (10847628).

Almost surely, 2^77740861 is an apocalyptic number.

It is an amenable number.

77740861 is a deficient number, since it is larger than the sum of its proper divisors (9040163).

77740861 is a wasteful number, since it uses less digits than its factorization.

77740861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164411.

The product of its (nonzero) digits is 65856, while the sum is 40.

The square root of 77740861 is about 8817.0778038985. The cubic root of 77740861 is about 426.7921754653.

The spelling of 77740861 in words is "seventy-seven million, seven hundred forty thousand, eight hundred sixty-one".