78142647 has 24 divisors (see below), whose sum is σ = 116433520. Its totient is φ = 46569600.

The previous prime is 78142637. The next prime is 78142657. The reversal of 78142647 is 74624187.

It is an interprime number because it is at equal distance from previous prime (78142637) and next prime (78142657).

It is not a de Polignac number, because 78142647 - 2⁸ = 78142391 is a prime.

It is a super-2 number, since 2×78142647² = 12212546560333218, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78142607) 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, 20379 + ... + 23907.

Almost surely, 2^78142647 is an apocalyptic number.

78142647 is a deficient number, since it is larger than the sum of its proper divisors (38290873).

78142647 is a wasteful number, since it uses less digits than its factorization.

78142647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3615 (or 3604 counting only the distinct ones).

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

The square root of 78142647 is about 8839.8329735352. The cubic root of 78142647 is about 427.5261719212.

The spelling of 78142647 in words is "seventy-eight million, one hundred forty-two thousand, six hundred forty-seven".