78501533 has 12 divisors (see below), whose sum is σ = 87922044. Its totient is φ = 70012800.

The previous prime is 78501503. The next prime is 78501539. The reversal of 78501533 is 33510587.

It can be written as a sum of positive squares in 2 ways, for example, as 38217124 + 40284409 = 6182^2 + 6347^2 .

It is not a de Polignac number, because 78501533 - 2¹² = 78497437 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78501533.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78501539) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 293 + ... + 12533.

It is an arithmetic number, because the mean of its divisors is an integer number (7326837).

Almost surely, 2^78501533 is an apocalyptic number.

It is an amenable number.

78501533 is a deficient number, since it is larger than the sum of its proper divisors (9420511).

78501533 is a wasteful number, since it uses less digits than its factorization.

78501533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12316 (or 12305 counting only the distinct ones).

The product of its (nonzero) digits is 12600, while the sum is 32.

The square root of 78501533 is about 8860.1090851072. The cubic root of 78501533 is about 428.1796727948.

The spelling of 78501533 in words is "seventy-eight million, five hundred one thousand, five hundred thirty-three".