78213573 has 8 divisors (see below), whose sum is σ = 115872000. Its totient is φ = 52142364.

The previous prime is 78213563. The next prime is 78213607. The reversal of 78213573 is 37531287.

78213573 is a `hidden beast` number, since 7 + 82 + 1 + 3 + 573 = 666.

It is not a de Polignac number, because 78213573 - 2⁹ = 78213061 is a prime.

It is a super-2 number, since 2×78213573² = 12234726002852658, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78213503) 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 7 ways as a sum of consecutive naturals, for example, 1448373 + ... + 1448426.

It is an arithmetic number, because the mean of its divisors is an integer number (14484000).

Almost surely, 2^78213573 is an apocalyptic number.

It is an amenable number.

78213573 is a deficient number, since it is larger than the sum of its proper divisors (37658427).

78213573 is a wasteful number, since it uses less digits than its factorization.

78213573 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2896808 (or 2896802 counting only the distinct ones).

The product of its digits is 35280, while the sum is 36.

The square root of 78213573 is about 8843.8437910221. The cubic root of 78213573 is about 427.6554805337.

The spelling of 78213573 in words is "seventy-eight million, two hundred thirteen thousand, five hundred seventy-three".