78472215 has 12 divisors (see below), whose sum is σ = 136018584. Its totient is φ = 41851824.

The previous prime is 78472213. The next prime is 78472217. The reversal of 78472215 is 51227487.

It is an interprime number because it is at equal distance from previous prime (78472213) and next prime (78472217).

It is not a de Polignac number, because 78472215 - 2¹ = 78472213 is a prime.

It is a super-4 number, since 4×78472215⁴ (a number of 33 digits) contains 4444 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78472215.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78472213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 871869 + ... + 871958.

It is an arithmetic number, because the mean of its divisors is an integer number (11334882).

Almost surely, 2^78472215 is an apocalyptic number.

78472215 is a deficient number, since it is larger than the sum of its proper divisors (57546369).

78472215 is a wasteful number, since it uses less digits than its factorization.

78472215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1743838 (or 1743835 counting only the distinct ones).

The product of its digits is 31360, while the sum is 36.

The square root of 78472215 is about 8858.4544362998. The cubic root of 78472215 is about 428.1263620110.

It can be divided in two parts, 78472 and 215, that added together give a palindrome (78687).

The spelling of 78472215 in words is "seventy-eight million, four hundred seventy-two thousand, two hundred fifteen".