78057511 has 4 divisors (see below), whose sum is σ = 89208592. Its totient is φ = 66906432.

The previous prime is 78057509. The next prime is 78057521. The reversal of 78057511 is 11575087.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 78057511 - 2¹ = 78057509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78057521) 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 3 ways as a sum of consecutive naturals, for example, 5575530 + ... + 5575543.

It is an arithmetic number, because the mean of its divisors is an integer number (22302148).

Almost surely, 2^78057511 is an apocalyptic number.

78057511 is a deficient number, since it is larger than the sum of its proper divisors (11151081).

78057511 is a wasteful number, since it uses less digits than its factorization.

78057511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11151080.

The product of its (nonzero) digits is 9800, while the sum is 34.

The square root of 78057511 is about 8835.0161856105. The cubic root of 78057511 is about 427.3708530012.

The spelling of 78057511 in words is "seventy-eight million, fifty-seven thousand, five hundred eleven".