78091371 has 40 divisors (see below), whose sum is σ = 122943744. Its totient is φ = 49302000.

The previous prime is 78091367. The next prime is 78091379. The reversal of 78091371 is 17319087.

It is not a de Polignac number, because 78091371 - 2² = 78091367 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78091379) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 310996 + ... + 311246.

Almost surely, 2^78091371 is an apocalyptic number.

78091371 is a deficient number, since it is larger than the sum of its proper divisors (44852373).

78091371 is a wasteful number, since it uses less digits than its factorization.

78091371 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 453 (or 444 counting only the distinct ones).

The product of its (nonzero) digits is 10584, while the sum is 36.

The square root of 78091371 is about 8836.9322165557. The cubic root of 78091371 is about 427.4326394328.

It can be divided in two parts, 7809 and 1371, that added together give a triangular number (9180 = T₁₃₅).

The spelling of 78091371 in words is "seventy-eight million, ninety-one thousand, three hundred seventy-one".