78995569 has 4 divisors (see below), whose sum is σ = 79027696. Its totient is φ = 78963444.

The previous prime is 78995537. The next prime is 78995573. The reversal of 78995569 is 96559987.

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, and also an emirpimes, since its reverse is a distinct semiprime: 96559987 = 457 ⋅211291.

It is a cyclic number.

It is not a de Polignac number, because 78995569 - 2⁵ = 78995537 is a prime.

It is a super-2 number, since 2×78995569² = 12480599843267522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78995269) 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, 12039 + ... + 17404.

It is an arithmetic number, because the mean of its divisors is an integer number (19756924).

Almost surely, 2^78995569 is an apocalyptic number.

It is an amenable number.

78995569 is a deficient number, since it is larger than the sum of its proper divisors (32127).

78995569 is a wasteful number, since it uses less digits than its factorization.

78995569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32126.

The product of its digits is 6123600, while the sum is 58.

The square root of 78995569 is about 8887.9451505958. The cubic root of 78995569 is about 429.0760203105.

The spelling of 78995569 in words is "seventy-eight million, nine hundred ninety-five thousand, five hundred sixty-nine".