766667421 has 24 divisors (see below), whose sum is σ = 1194342240. Its totient is φ = 471103776.

The previous prime is 766667387. The next prime is 766667437. The reversal of 766667421 is 124766667.

It is a happy number.

It is not a de Polignac number, because 766667421 - 2⁶ = 766667357 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (766667021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 82030 + ... + 90896.

It is an arithmetic number, because the mean of its divisors is an integer number (49764260).

Almost surely, 2^766667421 is an apocalyptic number.

It is an amenable number.

766667421 is a deficient number, since it is larger than the sum of its proper divisors (427674819).

766667421 is a wasteful number, since it uses less digits than its factorization.

766667421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9625 (or 9622 counting only the distinct ones).

The product of its digits is 508032, while the sum is 45.

The square root of 766667421 is about 27688.7598313828. The cubic root of 766667421 is about 915.2414269315.

The spelling of 766667421 in words is "seven hundred sixty-six million, six hundred sixty-seven thousand, four hundred twenty-one".