77621 has 2 divisors, whose sum is σ = 77622. Its totient is φ = 77620.
The previous prime is 77617. The next prime is 77641. The reversal of 77621 is 12677.
It is a happy number.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 70225 + 7396 = 265^2 + 86^2 .
It is a cyclic number.
It is not a de Polignac number, because 77621 - 22 = 77617 is a prime.
It is a nialpdrome in base 10.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (77611) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38810 + 38811.
It is an arithmetic number, because the mean of its divisors is an integer number (38811).
277621 is an apocalyptic number.
It is an amenable number.
77621 is a deficient number, since it is larger than the sum of its proper divisors (1).
77621 is an equidigital number, since it uses as much as digits as its factorization.
77621 is an evil number, because the sum of its binary digits is even.
The product of its digits is 588, while the sum is 23.
The square root of 77621 is about 278.6054557973. The cubic root of 77621 is about 42.6572719658.
It can be divided in two parts, 776 and 21, that added together give a palindrome (797).
The spelling of 77621 in words is "seventy-seven thousand, six hundred twenty-one".
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