78272547 has 4 divisors (see below), whose sum is σ = 104363400. Its totient is φ = 52181696.

The previous prime is 78272543. The next prime is 78272581. The reversal of 78272547 is 74527287.

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 78272547 - 2² = 78272543 is a prime.

It is a super-2 number, since 2×78272547² = 12253183227734418, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78272499 and 78272508.

It is not an unprimeable number, because it can be changed into a prime (78272543) 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, 13045422 + ... + 13045427.

It is an arithmetic number, because the mean of its divisors is an integer number (26090850).

Almost surely, 2^78272547 is an apocalyptic number.

78272547 is a deficient number, since it is larger than the sum of its proper divisors (26090853).

78272547 is a wasteful number, since it uses less digits than its factorization.

78272547 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26090852.

The product of its digits is 219520, while the sum is 42.

The square root of 78272547 is about 8847.1773464761. The cubic root of 78272547 is about 427.7629393677.

The spelling of 78272547 in words is "seventy-eight million, two hundred seventy-two thousand, five hundred forty-seven".