78273559 has 32 divisors (see below), whose sum is σ = 107412480. Its totient is φ = 55199232.

The previous prime is 78273557. The next prime is 78273563. The reversal of 78273559 is 95537287.

It is a 9-Lehmer number, since φ(78273559) divides (78273559-1)⁹.

It is a cyclic number.

It is not a de Polignac number, because 78273559 - 2¹ = 78273557 is a prime.

It is a super-2 number, since 2×78273559² = 12253500077052962, which contains 22 as substring.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78273557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28062 + ... + 30724.

It is an arithmetic number, because the mean of its divisors is an integer number (3356640).

Almost surely, 2^78273559 is an apocalyptic number.

78273559 is a deficient number, since it is larger than the sum of its proper divisors (29138921).

78273559 is a wasteful number, since it uses less digits than its factorization.

78273559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2719.

The product of its digits is 529200, while the sum is 46.

The square root of 78273559 is about 8847.2345396740. The cubic root of 78273559 is about 427.7647829014.

The spelling of 78273559 in words is "seventy-eight million, two hundred seventy-three thousand, five hundred fifty-nine".