78272643 has 4 divisors (see below), whose sum is σ = 104363528. Its totient is φ = 52181760.

The previous prime is 78272633. The next prime is 78272669. The reversal of 78272643 is 34627287.

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

It is not a de Polignac number, because 78272643 - 2⁴ = 78272627 is a prime.

It is a super-2 number, since 2×78272643² = 12253213284410898, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78272603) 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 3 ways as a sum of consecutive naturals, for example, 13045438 + ... + 13045443.

It is an arithmetic number, because the mean of its divisors is an integer number (26090882).

Almost surely, 2^78272643 is an apocalyptic number.

78272643 is a deficient number, since it is larger than the sum of its proper divisors (26090885).

78272643 is a wasteful number, since it uses less digits than its factorization.

78272643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26090884.

The product of its digits is 112896, while the sum is 39.

The square root of 78272643 is about 8847.1827719337. The cubic root of 78272643 is about 427.7631142491.

The spelling of 78272643 in words is "seventy-eight million, two hundred seventy-two thousand, six hundred forty-three".