8077621 has 2 divisors, whose sum is σ = 8077622. Its totient is φ = 8077620.

The previous prime is 8077607. The next prime is 8077633. The reversal of 8077621 is 1267708.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7700625 + 376996 = 2775^2 + 614^2 .

It is a cyclic number.

It is not a de Polignac number, because 8077621 - 2¹⁵ = 8044853 is a prime.

It is a super-2 number, since 2×8077621² = 130495922039282, which contains 22 as substring.

8077621 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8077651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4038810 + 4038811.

It is an arithmetic number, because the mean of its divisors is an integer number (4038811).

Almost surely, 2^8077621 is an apocalyptic number.

It is an amenable number.

8077621 is a deficient number, since it is larger than the sum of its proper divisors (1).

8077621 is an equidigital number, since it uses as much as digits as its factorization.

8077621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4704, while the sum is 31.

The square root of 8077621 is about 2842.1155852639. The cubic root of 8077621 is about 200.6447608502.

The spelling of 8077621 in words is "eight million, seventy-seven thousand, six hundred twenty-one".