73761921 has 12 divisors (see below), whose sum is σ = 110491472. Its totient is φ = 49174452.

The previous prime is 73761917. The next prime is 73761931. The reversal of 73761921 is 12916737.

It is a happy number.

73761921 is a `hidden beast` number, since 7 + 37 + 619 + 2 + 1 = 666.

It is not a de Polignac number, because 73761921 - 2² = 73761917 is a prime.

It is a super-2 number, since 2×73761921² = 10881641979220482, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (73761931) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 151531 + ... + 152016.

Almost surely, 2^73761921 is an apocalyptic number.

It is an amenable number.

73761921 is a deficient number, since it is larger than the sum of its proper divisors (36729551).

73761921 is an equidigital number, since it uses as much as digits as its factorization.

73761921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303562 (or 303550 counting only the distinct ones).

The product of its digits is 15876, while the sum is 36.

The square root of 73761921 is about 8588.4760580676. The cubic root of 73761921 is about 419.3829203382.

The spelling of 73761921 in words is "seventy-three million, seven hundred sixty-one thousand, nine hundred twenty-one".