76620321 has 12 divisors (see below), whose sum is σ = 110761872. Its totient is φ = 51039576.

The previous prime is 76620319. The next prime is 76620353. The reversal of 76620321 is 12302667.

It is a happy number.

76620321 is a `hidden beast` number, since 7 + 6 + 620 + 32 + 1 = 666.

It is not a de Polignac number, because 76620321 - 2¹ = 76620319 is a prime.

It is not an unprimeable number, because it can be changed into a prime (76620301) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12450 + ... + 17556.

It is an arithmetic number, because the mean of its divisors is an integer number (9230156).

Almost surely, 2^76620321 is an apocalyptic number.

It is an amenable number.

76620321 is a deficient number, since it is larger than the sum of its proper divisors (34141551).

76620321 is a wasteful number, since it uses less digits than its factorization.

76620321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6780 (or 6777 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 27.

The square root of 76620321 is about 8753.3034335615. The cubic root of 76620321 is about 424.7316802308.

Adding to 76620321 its reverse (12302667), we get a palindrome (88922988).

The spelling of 76620321 in words is "seventy-six million, six hundred twenty thousand, three hundred twenty-one".