74978447 has 2 divisors, whose sum is σ = 74978448. Its totient is φ = 74978446.

The previous prime is 74978443. The next prime is 74978471. The reversal of 74978447 is 74487947.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 74978447 - 2² = 74978443 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 74978395 and 74978404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74978441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37489223 + 37489224.

It is an arithmetic number, because the mean of its divisors is an integer number (37489224).

Almost surely, 2^74978447 is an apocalyptic number.

74978447 is a deficient number, since it is larger than the sum of its proper divisors (1).

74978447 is an equidigital number, since it uses as much as digits as its factorization.

74978447 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1580544, while the sum is 50.

The square root of 74978447 is about 8659.0095853972. The cubic root of 74978447 is about 421.6759321045.

The spelling of 74978447 in words is "seventy-four million, nine hundred seventy-eight thousand, four hundred forty-seven".