78578091 has 12 divisors (see below), whose sum is σ = 119475720. Its totient is φ = 49628160.

The previous prime is 78578089. The next prime is 78578107. The reversal of 78578091 is 19087587.

78578091 is a `hidden beast` number, since 78 + 578 + 0 + 9 + 1 = 666.

It is not a de Polignac number, because 78578091 - 2¹ = 78578089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78578021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 229590 + ... + 229931.

It is an arithmetic number, because the mean of its divisors is an integer number (9956310).

Almost surely, 2^78578091 is an apocalyptic number.

78578091 is a deficient number, since it is larger than the sum of its proper divisors (40897629).

78578091 is a wasteful number, since it uses less digits than its factorization.

78578091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 459546 (or 459543 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 45.

The square root of 78578091 is about 8864.4284079686. The cubic root of 78578091 is about 428.3188205183.

The spelling of 78578091 in words is "seventy-eight million, five hundred seventy-eight thousand, ninety-one".