78265587 has 4 divisors (see below), whose sum is σ = 104354120. Its totient is φ = 52177056.

The previous prime is 78265549. The next prime is 78265609. The reversal of 78265587 is 78556287.

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

It is not a de Polignac number, because 78265587 - 2¹¹ = 78263539 is a prime.

It is a super-2 number, since 2×78265587² = 12251004216909138, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78265507) 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, 13044262 + ... + 13044267.

It is an arithmetic number, because the mean of its divisors is an integer number (26088530).

Almost surely, 2^78265587 is an apocalyptic number.

78265587 is a deficient number, since it is larger than the sum of its proper divisors (26088533).

78265587 is a wasteful number, since it uses less digits than its factorization.

78265587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26088532.

The product of its digits is 940800, while the sum is 48.

The square root of 78265587 is about 8846.7839919374. The cubic root of 78265587 is about 427.7502600891.

The spelling of 78265587 in words is "seventy-eight million, two hundred sixty-five thousand, five hundred eighty-seven".