77632421 has 8 divisors (see below), whose sum is σ = 82301184. Its totient is φ = 72975040.

The previous prime is 77632403. The next prime is 77632447. The reversal of 77632421 is 12423677.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 77632421 - 2¹⁸ = 77370277 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 (77632021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14156 + ... + 18858.

It is an arithmetic number, because the mean of its divisors is an integer number (10287648).

Almost surely, 2^77632421 is an apocalyptic number.

It is an amenable number.

77632421 is a deficient number, since it is larger than the sum of its proper divisors (4668763).

77632421 is a wasteful number, since it uses less digits than its factorization.

77632421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5691.

The product of its digits is 14112, while the sum is 32.

The square root of 77632421 is about 8810.9262282691. The cubic root of 77632421 is about 426.5936403203.

The spelling of 77632421 in words is "seventy-seven million, six hundred thirty-two thousand, four hundred twenty-one".