77327021 has 8 divisors (see below), whose sum is σ = 80461080. Its totient is φ = 74224192.

The previous prime is 77327011. The next prime is 77327039. The reversal of 77327021 is 12072377.

It can be written as a sum of positive squares in 4 ways, for example, as 43744996 + 33582025 = 6614^2 + 5795^2 .

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 77327021 - 2⁶ = 77326957 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77327011) 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, 2690 + ... + 12723.

It is an arithmetic number, because the mean of its divisors is an integer number (10057635).

Almost surely, 2^77327021 is an apocalyptic number.

It is an amenable number.

77327021 is a deficient number, since it is larger than the sum of its proper divisors (3134059).

77327021 is a wasteful number, since it uses less digits than its factorization.

77327021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15615.

The product of its (nonzero) digits is 4116, while the sum is 29.

The square root of 77327021 is about 8793.5783956248. The cubic root of 77327021 is about 426.0335096007.

Adding to 77327021 its reverse (12072377), we get a palindrome (89399398).

The spelling of 77327021 in words is "seventy-seven million, three hundred twenty-seven thousand, twenty-one".