78217059 has 4 divisors (see below), whose sum is σ = 104289416. Its totient is φ = 52144704.

The previous prime is 78217057. The next prime is 78217081. The reversal of 78217059 is 95071287.

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

It is not a de Polignac number, because 78217059 - 2¹ = 78217057 is a prime.

It is a super-2 number, since 2×78217059² = 12235816637218962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78217057) 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, 13036174 + ... + 13036179.

It is an arithmetic number, because the mean of its divisors is an integer number (26072354).

Almost surely, 2^78217059 is an apocalyptic number.

78217059 is a deficient number, since it is larger than the sum of its proper divisors (26072357).

78217059 is a wasteful number, since it uses less digits than its factorization.

78217059 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26072356.

The product of its (nonzero) digits is 35280, while the sum is 39.

The square root of 78217059 is about 8844.0408750751. The cubic root of 78217059 is about 427.6618340126.

The spelling of 78217059 in words is "seventy-eight million, two hundred seventeen thousand, fifty-nine".