78379247 has 2 divisors, whose sum is σ = 78379248. Its totient is φ = 78379246.

The previous prime is 78379219. The next prime is 78379277. The reversal of 78379247 is 74297387.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78379247 - 2⁶ = 78379183 is a prime.

It is a super-2 number, since 2×78379247² = 12286612720574018, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78379277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39189623 + 39189624.

It is an arithmetic number, because the mean of its divisors is an integer number (39189624).

Almost surely, 2^78379247 is an apocalyptic number.

78379247 is a deficient number, since it is larger than the sum of its proper divisors (1).

78379247 is an equidigital number, since it uses as much as digits as its factorization.

78379247 is an evil number, because the sum of its binary digits is even.

The product of its digits is 592704, while the sum is 47.

The square root of 78379247 is about 8853.2054646890. The cubic root of 78379247 is about 427.9572245223.

The spelling of 78379247 in words is "seventy-eight million, three hundred seventy-nine thousand, two hundred forty-seven".