78136971 has 16 divisors (see below), whose sum is σ = 113857920. Its totient is φ = 47270720.

The previous prime is 78136969. The next prime is 78136997. The reversal of 78136971 is 17963187.

It is a cyclic number.

It is not a de Polignac number, because 78136971 - 2¹ = 78136969 is a prime.

It is a super-2 number, since 2×78136971² = 12210772474109682, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78136921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19951 + ... + 23543.

It is an arithmetic number, because the mean of its divisors is an integer number (7116120).

Almost surely, 2^78136971 is an apocalyptic number.

78136971 is a deficient number, since it is larger than the sum of its proper divisors (35720949).

78136971 is a wasteful number, since it uses less digits than its factorization.

78136971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4266.

The product of its digits is 63504, while the sum is 42.

The square root of 78136971 is about 8839.5119209151. The cubic root of 78136971 is about 427.5158203509.

The spelling of 78136971 in words is "seventy-eight million, one hundred thirty-six thousand, nine hundred seventy-one".