73687021 has 2 divisors, whose sum is σ = 73687022. Its totient is φ = 73687020.

The previous prime is 73687001. The next prime is 73687037. The reversal of 73687021 is 12078637.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62631396 + 11055625 = 7914^2 + 3325^2 .

It is a cyclic number.

It is not a de Polignac number, because 73687021 - 2¹⁵ = 73654253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73687001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36843510 + 36843511.

It is an arithmetic number, because the mean of its divisors is an integer number (36843511).

Almost surely, 2^73687021 is an apocalyptic number.

It is an amenable number.

73687021 is a deficient number, since it is larger than the sum of its proper divisors (1).

73687021 is an equidigital number, since it uses as much as digits as its factorization.

73687021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14112, while the sum is 34.

The square root of 73687021 is about 8584.1144563665. The cubic root of 73687021 is about 419.2409210588.

The spelling of 73687021 in words is "seventy-three million, six hundred eighty-seven thousand, twenty-one".