78971405 has 8 divisors (see below), whose sum is σ = 94896384. Its totient is φ = 63090000.

The previous prime is 78971281. The next prime is 78971407. The reversal of 78971405 is 50417987.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 78971405 - 2¹⁸ = 78709261 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78971407) 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, 6761 + ... + 14270.

It is an arithmetic number, because the mean of its divisors is an integer number (11862048).

Almost surely, 2^78971405 is an apocalyptic number.

It is an amenable number.

78971405 is a deficient number, since it is larger than the sum of its proper divisors (15924979).

78971405 is a wasteful number, since it uses less digits than its factorization.

78971405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21787.

The product of its (nonzero) digits is 70560, while the sum is 41.

The square root of 78971405 is about 8886.5856773004. The cubic root of 78971405 is about 429.0322657453.

The spelling of 78971405 in words is "seventy-eight million, nine hundred seventy-one thousand, four hundred five".