74885981 has 4 divisors (see below), whose sum is σ = 75432732. Its totient is φ = 74339232.

The previous prime is 74885971. The next prime is 74886013. The reversal of 74885981 is 18958847.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18958847 = 1609 ⋅11783.

It can be written as a sum of positive squares in 2 ways, for example, as 29539225 + 45346756 = 5435^2 + 6734^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-74885981 is a prime.

It is a super-2 number, since 2×74885981² = 11215820300664722, 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 (74885971) 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, 273170 + ... + 273443.

It is an arithmetic number, because the mean of its divisors is an integer number (18858183).

Almost surely, 2^74885981 is an apocalyptic number.

It is an amenable number.

74885981 is a deficient number, since it is larger than the sum of its proper divisors (546751).

74885981 is a wasteful number, since it uses less digits than its factorization.

74885981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 546750.

The product of its digits is 645120, while the sum is 50.

The square root of 74885981 is about 8653.6686439914. The cubic root of 74885981 is about 421.5025190438.

The spelling of 74885981 in words is "seventy-four million, eight hundred eighty-five thousand, nine hundred eighty-one".