71766649 has 4 divisors (see below), whose sum is σ = 72167760. Its totient is φ = 71365540.

The previous prime is 71766641. The next prime is 71766703. The reversal of 71766649 is 94666717.

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 71766649 - 2³ = 71766641 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 71766599 and 71766608.

It is not an unprimeable number, because it can be changed into a prime (71766641) 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, 200287 + ... + 200644.

It is an arithmetic number, because the mean of its divisors is an integer number (18041940).

Almost surely, 2^71766649 is an apocalyptic number.

It is an amenable number.

71766649 is a deficient number, since it is larger than the sum of its proper divisors (401111).

71766649 is a wasteful number, since it uses less digits than its factorization.

71766649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401110.

The product of its digits is 381024, while the sum is 46.

The square root of 71766649 is about 8471.5198754415. The cubic root of 71766649 is about 415.5668433449.

The spelling of 71766649 in words is "seventy-one million, seven hundred sixty-six thousand, six hundred forty-nine".