78372247 has 8 divisors (see below), whose sum is σ = 84418560. Its totient is φ = 72545880.

The previous prime is 78372241. The next prime is 78372269. The reversal of 78372247 is 74227387.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78372247 is a prime.

It is a super-3 number, since 3×78372247³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78372241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54247 + ... + 55672.

It is an arithmetic number, because the mean of its divisors is an integer number (10552320).

Almost surely, 2^78372247 is an apocalyptic number.

78372247 is a deficient number, since it is larger than the sum of its proper divisors (6046313).

78372247 is a wasteful number, since it uses less digits than its factorization.

78372247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109973.

The product of its digits is 131712, while the sum is 40.

The square root of 78372247 is about 8852.8101188267. The cubic root of 78372247 is about 427.9444839485.

The spelling of 78372247 in words is "seventy-eight million, three hundred seventy-two thousand, two hundred forty-seven".