78252559 has 24 divisors (see below), whose sum is σ = 101754576. Its totient is φ = 59472000.

The previous prime is 78252557. The next prime is 78252593. The reversal of 78252559 is 95525287.

It is not a de Polignac number, because 78252559 - 2¹ = 78252557 is a prime.

It is a super-2 number, since 2×78252559² = 12246925980096962, which contains 22 as substring.

Its product of digits (252000) is a multiple of the sum of its prime divisors (3600).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78252553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20329 + ... + 23869.

It is an arithmetic number, because the mean of its divisors is an integer number (4239774).

Almost surely, 2^78252559 is an apocalyptic number.

78252559 is a deficient number, since it is larger than the sum of its proper divisors (23502017).

78252559 is a wasteful number, since it uses less digits than its factorization.

78252559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3607 (or 3600 counting only the distinct ones).

The product of its digits is 252000, while the sum is 43.

The square root of 78252559 is about 8846.0476485264. The cubic root of 78252559 is about 427.7265244992.

The spelling of 78252559 in words is "seventy-eight million, two hundred fifty-two thousand, five hundred fifty-nine".