74972813 has 4 divisors (see below), whose sum is σ = 75421920. Its totient is φ = 74523708.

The previous prime is 74972783. The next prime is 74972819. The reversal of 74972813 is 31827947.

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, and also an emirpimes, since its reverse is a distinct semiprime: 31827947 = 991 ⋅32117.

It is a cyclic number.

It is not a de Polignac number, because 74972813 - 2⁶ = 74972749 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 (74972819) 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, 224303 + ... + 224636.

It is an arithmetic number, because the mean of its divisors is an integer number (18855480).

Almost surely, 2^74972813 is an apocalyptic number.

It is an amenable number.

74972813 is a deficient number, since it is larger than the sum of its proper divisors (449107).

74972813 is a wasteful number, since it uses less digits than its factorization.

74972813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 449106.

The product of its digits is 84672, while the sum is 41.

The square root of 74972813 is about 8658.6842533955. The cubic root of 74972813 is about 421.6653700395.

The spelling of 74972813 in words is "seventy-four million, nine hundred seventy-two thousand, eight hundred thirteen".