78878569 has 24 divisors (see below), whose sum is σ = 103420800. Its totient is φ = 58776960.

The previous prime is 78878509. The next prime is 78878599. The reversal of 78878569 is 96587887.

It is not a de Polignac number, because 78878569 - 2¹¹ = 78876521 is a prime.

It is a super-2 number, since 2×78878569² = 12443657294975522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78878509) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17457 + ... + 21505.

It is an arithmetic number, because the mean of its divisors is an integer number (4309200).

Almost surely, 2^78878569 is an apocalyptic number.

It is an amenable number.

78878569 is a deficient number, since it is larger than the sum of its proper divisors (24542231).

78878569 is a wasteful number, since it uses less digits than its factorization.

78878569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4101 (or 4090 counting only the distinct ones).

The product of its digits is 6773760, while the sum is 58.

The square root of 78878569 is about 8881.3607628561. The cubic root of 78878569 is about 428.8640814214.

The spelling of 78878569 in words is "seventy-eight million, eight hundred seventy-eight thousand, five hundred sixty-nine".