78216275 has 6 divisors (see below), whose sum is σ = 96988212. Its totient is φ = 62573000.

The previous prime is 78216197. The next prime is 78216283. The reversal of 78216275 is 57261287.

It is not a de Polignac number, because 78216275 - 2¹² = 78212179 is a prime.

It is a super-2 number, since 2×78216275² = 12235571349751250, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1564301 + ... + 1564350.

It is an arithmetic number, because the mean of its divisors is an integer number (16164702).

Almost surely, 2^78216275 is an apocalyptic number.

78216275 is a deficient number, since it is larger than the sum of its proper divisors (18771937).

78216275 is a wasteful number, since it uses less digits than its factorization.

78216275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3128661 (or 3128656 counting only the distinct ones).

The product of its digits is 47040, while the sum is 38.

The square root of 78216275 is about 8843.9965513336. The cubic root of 78216275 is about 427.6604051342.

The spelling of 78216275 in words is "seventy-eight million, two hundred sixteen thousand, two hundred seventy-five".