71776421 has 8 divisors (see below), whose sum is σ = 74362080. Its totient is φ = 69198192.

The previous prime is 71776381. The next prime is 71776423. The reversal of 71776421 is 12467717.

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 71776421 - 2¹⁰ = 71775397 is a prime.

It is a super-2 number, since 2×71776421² = 10303709223138482, 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 (71776423) 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, 24206 + ... + 27008.

It is an arithmetic number, because the mean of its divisors is an integer number (9295260).

Almost surely, 2^71776421 is an apocalyptic number.

It is an amenable number.

71776421 is a deficient number, since it is larger than the sum of its proper divisors (2585659).

71776421 is a wasteful number, since it uses less digits than its factorization.

71776421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3715.

The product of its digits is 16464, while the sum is 35.

The square root of 71776421 is about 8472.0966118193. The cubic root of 71776421 is about 415.5857041711.

The spelling of 71776421 in words is "seventy-one million, seven hundred seventy-six thousand, four hundred twenty-one".