74909821 has 8 divisors (see below), whose sum is σ = 85837824. Its totient is φ = 64038480.

The previous prime is 74909801. The next prime is 74909831. The reversal of 74909821 is 12890947.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 74909821 - 2⁷ = 74909693 is a prime.

It is a super-2 number, since 2×74909821² = 11222962564504082, 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 (74909801) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11290 + ... + 16651.

It is an arithmetic number, because the mean of its divisors is an integer number (10729728).

Almost surely, 2^74909821 is an apocalyptic number.

It is an amenable number.

74909821 is a deficient number, since it is larger than the sum of its proper divisors (10928003).

74909821 is a wasteful number, since it uses less digits than its factorization.

74909821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28331.

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 74909821 is about 8655.0459848576. The cubic root of 74909821 is about 421.5472428305.

The spelling of 74909821 in words is "seventy-four million, nine hundred nine thousand, eight hundred twenty-one".