73763991 has 12 divisors (see below), whose sum is σ = 121769232. Its totient is φ = 42150816.

The previous prime is 73763929. The next prime is 73763999. The reversal of 73763991 is 19936737.

73763991 is a `hidden beast` number, since 7 + 3 + 7 + 639 + 9 + 1 = 666.

It is not a de Polignac number, because 73763991 - 2⁹ = 73763479 is a prime.

It is a super-2 number, since 2×73763991² = 10882252736496162, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73763999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 585366 + ... + 585491.

It is an arithmetic number, because the mean of its divisors is an integer number (10147436).

Almost surely, 2^73763991 is an apocalyptic number.

73763991 is a deficient number, since it is larger than the sum of its proper divisors (48005241).

73763991 is a wasteful number, since it uses less digits than its factorization.

73763991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1170870 (or 1170867 counting only the distinct ones).

The product of its digits is 214326, while the sum is 45.

The square root of 73763991 is about 8588.5965675423. The cubic root of 73763991 is about 419.3868433855.

The spelling of 73763991 in words is "seventy-three million, seven hundred sixty-three thousand, nine hundred ninety-one".