76780421 has 4 divisors (see below), whose sum is σ = 77240352. Its totient is φ = 76320492.

The previous prime is 76780399. The next prime is 76780427. The reversal of 76780421 is 12408767.

It is a happy number.

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 a de Polignac number, because none of the positive numbers 2^k-76780421 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 (76780427) 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, 229715 + ... + 230048.

It is an arithmetic number, because the mean of its divisors is an integer number (19310088).

Almost surely, 2^76780421 is an apocalyptic number.

It is an amenable number.

76780421 is a deficient number, since it is larger than the sum of its proper divisors (459931).

76780421 is a wasteful number, since it uses less digits than its factorization.

76780421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 459930.

The product of its (nonzero) digits is 18816, while the sum is 35.

The square root of 76780421 is about 8762.4437801335. The cubic root of 76780421 is about 425.0273034362.

The spelling of 76780421 in words is "seventy-six million, seven hundred eighty thousand, four hundred twenty-one".