78901447 has 4 divisors (see below), whose sum is σ = 79107840. Its totient is φ = 78695056.

The previous prime is 78901439. The next prime is 78901453. The reversal of 78901447 is 74410987.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74410987 = 7 ⋅10630141.

It is a cyclic number.

It is not a de Polignac number, because 78901447 - 2³ = 78901439 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78901457) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 102622 + ... + 103387.

It is an arithmetic number, because the mean of its divisors is an integer number (19776960).

Almost surely, 2^78901447 is an apocalyptic number.

78901447 is a deficient number, since it is larger than the sum of its proper divisors (206393).

78901447 is a wasteful number, since it uses less digits than its factorization.

78901447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206392.

The product of its (nonzero) digits is 56448, while the sum is 40.

The square root of 78901447 is about 8882.6486477852. The cubic root of 78901447 is about 428.9055401013.

The spelling of 78901447 in words is "seventy-eight million, nine hundred one thousand, four hundred forty-seven".