78028769 has 8 divisors (see below), whose sum is σ = 96035520. Its totient is φ = 61736976.

The previous prime is 78028757. The next prime is 78028799. The reversal of 78028769 is 96782087.

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

It is a de Polignac number, because none of the positive numbers 2^k-78028769 is a prime.

It is a super-2 number, since 2×78028769² = 12176977583310722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78028729) 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, 428639 + ... + 428820.

It is an arithmetic number, because the mean of its divisors is an integer number (12004440).

Almost surely, 2^78028769 is an apocalyptic number.

It is an amenable number.

78028769 is a deficient number, since it is larger than the sum of its proper divisors (18006751).

78028769 is a wasteful number, since it uses less digits than its factorization.

78028769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 857479.

The product of its (nonzero) digits is 338688, while the sum is 47.

The square root of 78028769 is about 8833.3894400734. The cubic root of 78028769 is about 427.3183916776.

The spelling of 78028769 in words is "seventy-eight million, twenty-eight thousand, seven hundred sixty-nine".