78655671 has 24 divisors (see below), whose sum is σ = 119507280. Its totient is φ = 51128640.

The previous prime is 78655663. The next prime is 78655679. The reversal of 78655671 is 17655687.

78655671 is a `hidden beast` number, since 7 + 86 + 5 + 567 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (78655663) and next prime (78655679).

It is not a de Polignac number, because 78655671 - 2³ = 78655663 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78655679) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 44521 + ... + 46253.

It is an arithmetic number, because the mean of its divisors is an integer number (4979470).

Almost surely, 2^78655671 is an apocalyptic number.

78655671 is a deficient number, since it is larger than the sum of its proper divisors (40851609).

78655671 is a wasteful number, since it uses less digits than its factorization.

78655671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1824 (or 1777 counting only the distinct ones).

The product of its digits is 352800, while the sum is 45.

The square root of 78655671 is about 8868.8032450833. The cubic root of 78655671 is about 428.4597336067.

The spelling of 78655671 in words is "seventy-eight million, six hundred fifty-five thousand, six hundred seventy-one".