73853621 has 4 divisors (see below), whose sum is σ = 77064672. Its totient is φ = 70642572.

The previous prime is 73853617. The next prime is 73853641. The reversal of 73853621 is 12635837.

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: 12635837 = 83 ⋅152239.

It is a cyclic number.

It is not a de Polignac number, because 73853621 - 2² = 73853617 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 (73853641) 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, 1605491 + ... + 1605536.

It is an arithmetic number, because the mean of its divisors is an integer number (19266168).

Almost surely, 2^73853621 is an apocalyptic number.

It is an amenable number.

73853621 is a deficient number, since it is larger than the sum of its proper divisors (3211051).

73853621 is a wasteful number, since it uses less digits than its factorization.

73853621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3211050.

The product of its digits is 30240, while the sum is 35.

The square root of 73853621 is about 8593.8129488604. The cubic root of 73853621 is about 419.5566390974.

The spelling of 73853621 in words is "seventy-three million, eight hundred fifty-three thousand, six hundred twenty-one".