766980421 has 4 divisors (see below), whose sum is σ = 767035872. Its totient is φ = 766924972.

The previous prime is 766980419. The next prime is 766980439. The reversal of 766980421 is 124089667.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 766980421 - 2¹ = 766980419 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (766990421) 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, 11910 + ... + 40936.

It is an arithmetic number, because the mean of its divisors is an integer number (191758968).

Almost surely, 2^766980421 is an apocalyptic number.

It is an amenable number.

766980421 is a deficient number, since it is larger than the sum of its proper divisors (55451).

766980421 is a wasteful number, since it uses less digits than its factorization.

766980421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55450.

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 766980421 is about 27694.4113676388. The cubic root of 766980421 is about 915.3659622832.

The spelling of 766980421 in words is "seven hundred sixty-six million, nine hundred eighty thousand, four hundred twenty-one".