73640371391 has 8 divisors (see below), whose sum is σ = 73728348960. Its totient is φ = 73552434912.

The previous prime is 73640371373. The next prime is 73640371393. The reversal of 73640371391 is 19317304637.

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 73640371391 - 2¹⁰ = 73640370367 is a prime.

It is a super-2 number, since 2×73640371391² (a number of 23 digits) 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 (73640371393) 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, 4897601 + ... + 4912613.

It is an arithmetic number, because the mean of its divisors is an integer number (9216043620).

Almost surely, 2^73640371391 is an apocalyptic number.

73640371391 is a deficient number, since it is larger than the sum of its proper divisors (87977569).

73640371391 is a wasteful number, since it uses less digits than its factorization.

73640371391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20545.

The product of its (nonzero) digits is 285768, while the sum is 44.

The spelling of 73640371391 in words is "seventy-three billion, six hundred forty million, three hundred seventy-one thousand, three hundred ninety-one".