78272528 has 20 divisors (see below), whose sum is σ = 151924800. Its totient is φ = 39066144.

The previous prime is 78272521. The next prime is 78272543. The reversal of 78272528 is 82527287.

It is a happy number.

It is a super-2 number, since 2×78272528² = 12253177279021568, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78272521) 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, 5501 + ... + 13667.

It is an arithmetic number, because the mean of its divisors is an integer number (7596240).

Almost surely, 2^78272528 is an apocalyptic number.

It is an amenable number.

78272528 is a deficient number, since it is larger than the sum of its proper divisors (73652272).

78272528 is a wasteful number, since it uses less digits than its factorization.

78272528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8774 (or 8768 counting only the distinct ones).

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

The square root of 78272528 is about 8847.1762726872. The cubic root of 78272528 is about 427.7629047558.

The spelling of 78272528 in words is "seventy-eight million, two hundred seventy-two thousand, five hundred twenty-eight".