78672245 has 4 divisors (see below), whose sum is σ = 94406700. Its totient is φ = 62937792.

The previous prime is 78672239. The next prime is 78672257. The reversal of 78672245 is 54227687.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54227687 = 43 ⋅1261109.

It can be written as a sum of positive squares in 2 ways, for example, as 20775364 + 57896881 = 4558^2 + 7609^2 .

It is a cyclic number.

It is not a de Polignac number, because 78672245 - 2²² = 74477941 is a prime.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 7867220 + ... + 7867229.

It is an arithmetic number, because the mean of its divisors is an integer number (23601675).

Almost surely, 2^78672245 is an apocalyptic number.

It is an amenable number.

78672245 is a deficient number, since it is larger than the sum of its proper divisors (15734455).

78672245 is a wasteful number, since it uses less digits than its factorization.

78672245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15734454.

The product of its digits is 188160, while the sum is 41.

The square root of 78672245 is about 8869.7375947657. The cubic root of 78672245 is about 428.4898259184.

The spelling of 78672245 in words is "seventy-eight million, six hundred seventy-two thousand, two hundred forty-five".