74690821 has 4 divisors (see below), whose sum is σ = 77938272. Its totient is φ = 71443372.

The previous prime is 74690789. The next prime is 74690851. The reversal of 74690821 is 12809647.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 74690821 - 2⁵ = 74690789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74690851) 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, 1623691 + ... + 1623736.

It is an arithmetic number, because the mean of its divisors is an integer number (19484568).

Almost surely, 2^74690821 is an apocalyptic number.

It is an amenable number.

74690821 is a deficient number, since it is larger than the sum of its proper divisors (3247451).

74690821 is a wasteful number, since it uses less digits than its factorization.

74690821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3247450.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 74690821 is about 8642.3851453172. The cubic root of 74690821 is about 421.1360419290.

The spelling of 74690821 in words is "seventy-four million, six hundred ninety thousand, eight hundred twenty-one".