78554971 has 4 divisors (see below), whose sum is σ = 85696344. Its totient is φ = 71413600.

The previous prime is 78554969. The next prime is 78554989. The reversal of 78554971 is 17945587.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 78554971 - 2¹ = 78554969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78554171) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3570670 + ... + 3570691.

It is an arithmetic number, because the mean of its divisors is an integer number (21424086).

Almost surely, 2^78554971 is an apocalyptic number.

78554971 is a deficient number, since it is larger than the sum of its proper divisors (7141373).

78554971 is a wasteful number, since it uses less digits than its factorization.

78554971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7141372.

The product of its digits is 352800, while the sum is 46.

The square root of 78554971 is about 8863.1242234327. The cubic root of 78554971 is about 428.2768083730.

The spelling of 78554971 in words is "seventy-eight million, five hundred fifty-four thousand, nine hundred seventy-one".