78204587 has 4 divisors (see below), whose sum is σ = 78729600. Its totient is φ = 77679576.

The previous prime is 78204541. The next prime is 78204593. The reversal of 78204587 is 78540287.

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

It is a cyclic number.

It is not a de Polignac number, because 78204587 - 2⁶ = 78204523 is a prime.

It is a super-2 number, since 2×78204587² = 12231914855681138, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78204787) 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, 262283 + ... + 262580.

It is an arithmetic number, because the mean of its divisors is an integer number (19682400).

Almost surely, 2^78204587 is an apocalyptic number.

78204587 is a deficient number, since it is larger than the sum of its proper divisors (525013).

78204587 is a wasteful number, since it uses less digits than its factorization.

78204587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 525012.

The product of its (nonzero) digits is 125440, while the sum is 41.

The square root of 78204587 is about 8843.3357394142. The cubic root of 78204587 is about 427.6391020494.

The spelling of 78204587 in words is "seventy-eight million, two hundred four thousand, five hundred eighty-seven".