71663401 has 4 divisors (see below), whose sum is σ = 72733072. Its totient is φ = 70593732.

The previous prime is 71663341. The next prime is 71663429. The reversal of 71663401 is 10436617.

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.

It is a cyclic number.

It is not a de Polignac number, because 71663401 - 2¹³ = 71655209 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 71663401.

It is not an unprimeable number, because it can be changed into a prime (71663441) 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, 534735 + ... + 534868.

It is an arithmetic number, because the mean of its divisors is an integer number (18183268).

Almost surely, 2^71663401 is an apocalyptic number.

It is an amenable number.

71663401 is a deficient number, since it is larger than the sum of its proper divisors (1069671).

71663401 is a wasteful number, since it uses less digits than its factorization.

71663401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1069670.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 71663401 is about 8465.4238523538. The cubic root of 71663401 is about 415.3674608626.

The spelling of 71663401 in words is "seventy-one million, six hundred sixty-three thousand, four hundred one".