73687973 has 2 divisors, whose sum is σ = 73687974. Its totient is φ = 73687972.

The previous prime is 73687969. The next prime is 73687997. The reversal of 73687973 is 37978637.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73650724 + 37249 = 8582^2 + 193^2 .

It is a cyclic number.

It is not a de Polignac number, because 73687973 - 2² = 73687969 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73687903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36843986 + 36843987.

It is an arithmetic number, because the mean of its divisors is an integer number (36843987).

Almost surely, 2^73687973 is an apocalyptic number.

It is an amenable number.

73687973 is a deficient number, since it is larger than the sum of its proper divisors (1).

73687973 is an equidigital number, since it uses as much as digits as its factorization.

73687973 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1333584, while the sum is 50.

The square root of 73687973 is about 8584.1699074517. The cubic root of 73687973 is about 419.2427265131.

The spelling of 73687973 in words is "seventy-three million, six hundred eighty-seven thousand, nine hundred seventy-three".