71793781 has 8 divisors (see below), whose sum is σ = 72805824. Its totient is φ = 70788000.

The previous prime is 71793773. The next prime is 71793793. The reversal of 71793781 is 18739717.

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 71793781 - 2³ = 71793773 is a prime.

It is a super-2 number, since 2×71793781² = 10308693980551922, 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 (71793731) 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, 24465 + ... + 27241.

It is an arithmetic number, because the mean of its divisors is an integer number (9100728).

Almost surely, 2^71793781 is an apocalyptic number.

It is an amenable number.

71793781 is a deficient number, since it is larger than the sum of its proper divisors (1012043).

71793781 is a wasteful number, since it uses less digits than its factorization.

71793781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3131.

The product of its digits is 74088, while the sum is 43.

The square root of 71793781 is about 8473.1210896576. The cubic root of 71793781 is about 415.6192062885.

The spelling of 71793781 in words is "seventy-one million, seven hundred ninety-three thousand, seven hundred eighty-one".