78272775 has 36 divisors (see below), whose sum is σ = 160226352. Its totient is φ = 35781120.

The previous prime is 78272759. The next prime is 78272783. The reversal of 78272775 is 57727287.

It is a happy number.

It is not a de Polignac number, because 78272775 - 2⁴ = 78272759 is a prime.

It is a super-2 number, since 2×78272775² = 12253254612401250, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 78272775.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 23274 + ... + 26423.

It is an arithmetic number, because the mean of its divisors is an integer number (4450732).

Almost surely, 2^78272775 is an apocalyptic number.

78272775 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

78272775 is an abundant number, since it is smaller than the sum of its proper divisors (81953577).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78272775 is a wasteful number, since it uses less digits than its factorization.

78272775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49720 (or 49712 counting only the distinct ones).

The product of its digits is 384160, while the sum is 45.

The square root of 78272775 is about 8847.1902319324. The cubic root of 78272775 is about 427.7633547107.

The spelling of 78272775 in words is "seventy-eight million, two hundred seventy-two thousand, seven hundred seventy-five".