78372347 has 4 divisors (see below), whose sum is σ = 78396216. Its totient is φ = 78348480.

The previous prime is 78372337. The next prime is 78372367. The reversal of 78372347 is 74327387.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74327387 = 79 ⋅940853.

It is a cyclic number.

It is not a de Polignac number, because 78372347 - 2⁴ = 78372331 is a prime.

It is a super-2 number, since 2×78372347² = 12284449548576818, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78372337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6038 + ... + 13899.

It is an arithmetic number, because the mean of its divisors is an integer number (19599054).

Almost surely, 2^78372347 is an apocalyptic number.

78372347 is a deficient number, since it is larger than the sum of its proper divisors (23869).

78372347 is a wasteful number, since it uses less digits than its factorization.

78372347 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23868.

The product of its digits is 197568, while the sum is 41.

The square root of 78372347 is about 8852.8157667490. The cubic root of 78372347 is about 427.9446659620.

The spelling of 78372347 in words is "seventy-eight million, three hundred seventy-two thousand, three hundred forty-seven".