78057869 has 4 divisors (see below), whose sum is σ = 78078144. Its totient is φ = 78037596.

The previous prime is 78057853. The next prime is 78057877. The reversal of 78057869 is 96875087.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 78057869 - 2⁴ = 78057853 is a prime.

It is a super-2 number, since 2×78057869² = 12186061825642322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78057899) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2387 + ... + 12720.

It is an arithmetic number, because the mean of its divisors is an integer number (19519536).

Almost surely, 2^78057869 is an apocalyptic number.

It is an amenable number.

78057869 is a deficient number, since it is larger than the sum of its proper divisors (20275).

78057869 is a wasteful number, since it uses less digits than its factorization.

78057869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20274.

The product of its (nonzero) digits is 846720, while the sum is 50.

The square root of 78057869 is about 8835.0364458784. The cubic root of 78057869 is about 427.3715063593.

The spelling of 78057869 in words is "seventy-eight million, fifty-seven thousand, eight hundred sixty-nine".