80000639 has 2 divisors, whose sum is σ = 80000640. Its totient is φ = 80000638.

The previous prime is 80000617. The next prime is 80000681. The reversal of 80000639 is 93600008.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 80000639 - 2²⁴ = 63223423 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80000689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40000319 + 40000320.

It is an arithmetic number, because the mean of its divisors is an integer number (40000320).

Almost surely, 2^80000639 is an apocalyptic number.

80000639 is a deficient number, since it is larger than the sum of its proper divisors (1).

80000639 is an equidigital number, since it uses as much as digits as its factorization.

80000639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 80000639 is about 8944.3076311138. The cubic root of 80000639 is about 430.8880852398. Note that the first 3 decimals are identical.

The spelling of 80000639 in words is "eighty million, six hundred thirty-nine", and thus it is an aban number.