74721863 has 2 divisors, whose sum is σ = 74721864. Its totient is φ = 74721862.

The previous prime is 74721839. The next prime is 74721877. The reversal of 74721863 is 36812747.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 74721863 - 2⁶ = 74721799 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74721263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37360931 + 37360932.

It is an arithmetic number, because the mean of its divisors is an integer number (37360932).

Almost surely, 2^74721863 is an apocalyptic number.

74721863 is a deficient number, since it is larger than the sum of its proper divisors (1).

74721863 is an equidigital number, since it uses as much as digits as its factorization.

74721863 is an evil number, because the sum of its binary digits is even.

The product of its digits is 56448, while the sum is 38.

The square root of 74721863 is about 8644.1808750164. The cubic root of 74721863 is about 421.1943761580.

The spelling of 74721863 in words is "seventy-four million, seven hundred twenty-one thousand, eight hundred sixty-three".