78148791 has 24 divisors (see below), whose sum is σ = 129845664. Its totient is φ = 44366400.

The previous prime is 78148787. The next prime is 78148793. The reversal of 78148791 is 19784187.

78148791 is a `hidden beast` number, since 7 + 81 + 487 + 91 = 666.

It is not a de Polignac number, because 78148791 - 2² = 78148787 is a prime.

It is a super-2 number, since 2×78148791² = 12214467069523362, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78148793) 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, 5941 + ... + 13841.

It is an arithmetic number, because the mean of its divisors is an integer number (5410236).

Almost surely, 2^78148791 is an apocalyptic number.

78148791 is a deficient number, since it is larger than the sum of its proper divisors (51696873).

78148791 is a wasteful number, since it uses less digits than its factorization.

78148791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8071 (or 8068 counting only the distinct ones).

The product of its digits is 112896, while the sum is 45.

The square root of 78148791 is about 8840.1804845829. The cubic root of 78148791 is about 427.5373764386.

The spelling of 78148791 in words is "seventy-eight million, one hundred forty-eight thousand, seven hundred ninety-one".