77509421 has 8 divisors (see below), whose sum is σ = 85989600. Its totient is φ = 69268240.

The previous prime is 77509381. The next prime is 77509423. The reversal of 77509421 is 12490577.

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 77509421 - 2¹⁴ = 77493037 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 (77509423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59066 + ... + 60363.

It is an arithmetic number, because the mean of its divisors is an integer number (10748700).

Almost surely, 2^77509421 is an apocalyptic number.

It is an amenable number.

77509421 is a deficient number, since it is larger than the sum of its proper divisors (8480179).

77509421 is a wasteful number, since it uses less digits than its factorization.

77509421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119499.

The product of its (nonzero) digits is 17640, while the sum is 35.

The square root of 77509421 is about 8803.9434914134. The cubic root of 77509421 is about 426.3682243879.

Adding to 77509421 its reverse (12490577), we get a palindrome (89999998).

It can be divided in two parts, 7750 and 9421, that added together give a palindrome (17171).

The spelling of 77509421 in words is "seventy-seven million, five hundred nine thousand, four hundred twenty-one".