76621 has 4 divisors (see below), whose sum is σ = 77212. Its totient is φ = 76032.

The previous prime is 76607. The next prime is 76631. The reversal of 76621 is 12667.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 12667 = 53 ⋅239.

It can be written as a sum of positive squares in 2 ways, for example, as 34596 + 42025 = 186^2 + 205^2 .

It is a cyclic number.

It is not a de Polignac number, because 76621 - 2⁷ = 76493 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 76592 and 76601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (76631) 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, 6 + ... + 391.

It is an arithmetic number, because the mean of its divisors is an integer number (19303).

2⁷⁶⁶²¹ is an apocalyptic number.

It is an amenable number.

76621 is a deficient number, since it is larger than the sum of its proper divisors (591).

76621 is a wasteful number, since it uses less digits than its factorization.

76621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 590.

The product of its digits is 504, while the sum is 22.

The square root of 76621 is about 276.8049855042. The cubic root of 76621 is about 42.4732934867.

It can be divided in two parts, 766 and 21, that added together give a palindrome (787).

The spelling of 76621 in words is "seventy-six thousand, six hundred twenty-one".