78057091 has 8 divisors (see below), whose sum is σ = 89280000. Its totient is φ = 66852168.

The previous prime is 78057061. The next prime is 78057107. The reversal of 78057091 is 19075087.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 78057091 - 2²³ = 69668483 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78057091.

It is not an unprimeable number, because it can be changed into a prime (78057041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6660 + ... + 14158.

It is an arithmetic number, because the mean of its divisors is an integer number (11160000).

Almost surely, 2^78057091 is an apocalyptic number.

78057091 is a deficient number, since it is larger than the sum of its proper divisors (11222909).

78057091 is a wasteful number, since it uses less digits than its factorization.

78057091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8993.

The product of its (nonzero) digits is 17640, while the sum is 37.

The square root of 78057091 is about 8834.9924165219. The cubic root of 78057091 is about 427.3700864891.

The spelling of 78057091 in words is "seventy-eight million, fifty-seven thousand, ninety-one".