64019863 has 2 divisors, whose sum is σ = 64019864. Its totient is φ = 64019862.

The previous prime is 64019843. The next prime is 64019869. The reversal of 64019863 is 36891046.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64019863 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64019869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32009931 + 32009932.

It is an arithmetic number, because the mean of its divisors is an integer number (32009932).

Almost surely, 2^64019863 is an apocalyptic number.

64019863 is a deficient number, since it is larger than the sum of its proper divisors (1).

64019863 is an equidigital number, since it uses as much as digits as its factorization.

64019863 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 64019863 is about 8001.2413411920. The cubic root of 64019863 is about 400.0413769697.

It can be divided in two parts, 640 and 19863, that added together give a triangular number (20503 = T₂₀₂).

The spelling of 64019863 in words is "sixty-four million, nineteen thousand, eight hundred sixty-three".