67631649 has 4 divisors (see below), whose sum is σ = 90175536. Its totient is φ = 45087764.

The previous prime is 67631587. The next prime is 67631693. The reversal of 67631649 is 94613676.

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 67631649 - 2¹⁷ = 67500577 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 67631649.

It is not an unprimeable number, because it can be changed into a prime (67631149) 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, 11271939 + ... + 11271944.

It is an arithmetic number, because the mean of its divisors is an integer number (22543884).

Almost surely, 2^67631649 is an apocalyptic number.

It is an amenable number.

67631649 is a deficient number, since it is larger than the sum of its proper divisors (22543887).

67631649 is a wasteful number, since it uses less digits than its factorization.

67631649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22543886.

The product of its digits is 163296, while the sum is 42.

The square root of 67631649 is about 8223.8463628645. The cubic root of 67631649 is about 407.4271745604.

The spelling of 67631649 in words is "sixty-seven million, six hundred thirty-one thousand, six hundred forty-nine".