71620431 has 4 divisors (see below), whose sum is σ = 95493912. Its totient is φ = 47746952.

The previous prime is 71620429. The next prime is 71620441. The reversal of 71620431 is 13402617.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 71620431 - 2¹ = 71620429 is a prime.

It is a super-2 number, since 2×71620431² = 10258972273251522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71620411) 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, 11936736 + ... + 11936741.

It is an arithmetic number, because the mean of its divisors is an integer number (23873478).

Almost surely, 2^71620431 is an apocalyptic number.

71620431 is a deficient number, since it is larger than the sum of its proper divisors (23873481).

71620431 is a wasteful number, since it uses less digits than its factorization.

71620431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23873480.

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 71620431 is about 8462.8855008206. The cubic root of 71620431 is about 415.2844249471.

The spelling of 71620431 in words is "seventy-one million, six hundred twenty thousand, four hundred thirty-one".