73885981 has 4 divisors (see below), whose sum is σ = 79569532. Its totient is φ = 68202432.

The previous prime is 73885979. The next prime is 73886011. The reversal of 73885981 is 18958837.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 50893956 + 22992025 = 7134^2 + 4795^2 .

It is a cyclic number.

It is not a de Polignac number, because 73885981 - 2¹ = 73885979 is a prime.

It is a super-2 number, since 2×73885981² = 10918276376664722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73885901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2841756 + ... + 2841781.

It is an arithmetic number, because the mean of its divisors is an integer number (19892383).

Almost surely, 2^73885981 is an apocalyptic number.

It is an amenable number.

73885981 is a deficient number, since it is larger than the sum of its proper divisors (5683551).

73885981 is a wasteful number, since it uses less digits than its factorization.

73885981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5683550.

The product of its digits is 483840, while the sum is 49.

The square root of 73885981 is about 8595.6954925125. The cubic root of 73885981 is about 419.6179083585.

The spelling of 73885981 in words is "seventy-three million, eight hundred eighty-five thousand, nine hundred eighty-one".