73643987 has 2 divisors, whose sum is σ = 73643988. Its totient is φ = 73643986.

The previous prime is 73643959. The next prime is 73644031. The reversal of 73643987 is 78934637.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 73643987 - 2⁶ = 73643923 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (73643587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36821993 + 36821994.

It is an arithmetic number, because the mean of its divisors is an integer number (36821994).

Almost surely, 2^73643987 is an apocalyptic number.

73643987 is a deficient number, since it is larger than the sum of its proper divisors (1).

73643987 is an equidigital number, since it uses as much as digits as its factorization.

73643987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 762048, while the sum is 47.

The square root of 73643987 is about 8581.6074834497. The cubic root of 73643987 is about 419.1592914545.

The spelling of 73643987 in words is "seventy-three million, six hundred forty-three thousand, nine hundred eighty-seven".