80647649 has 4 divisors (see below), whose sum is σ = 81070080. Its totient is φ = 80225220.

The previous prime is 80647601. The next prime is 80647657. The reversal of 80647649 is 94674608.

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 80647649 - 2⁸ = 80647393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (80647849) 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, 210929 + ... + 211310.

It is an arithmetic number, because the mean of its divisors is an integer number (20267520).

Almost surely, 2^80647649 is an apocalyptic number.

It is an amenable number.

80647649 is a deficient number, since it is larger than the sum of its proper divisors (422431).

80647649 is a wasteful number, since it uses less digits than its factorization.

80647649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 422430.

The product of its (nonzero) digits is 290304, while the sum is 44.

The square root of 80647649 is about 8980.4036100835. The cubic root of 80647649 is about 432.0465788396.

The spelling of 80647649 in words is "eighty million, six hundred forty-seven thousand, six hundred forty-nine".