77636513 has 2 divisors, whose sum is σ = 77636514. Its totient is φ = 77636512.

The previous prime is 77636473. The next prime is 77636519. The reversal of 77636513 is 31563677.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50523664 + 27112849 = 7108^2 + 5207^2 .

It is a cyclic number.

It is not a de Polignac number, because 77636513 - 2¹⁴ = 77620129 is a prime.

It is a super-3 number, since 3×77636513³ (a number of 25 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (77636519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38818256 + 38818257.

It is an arithmetic number, because the mean of its divisors is an integer number (38818257).

Almost surely, 2^77636513 is an apocalyptic number.

It is an amenable number.

77636513 is a deficient number, since it is larger than the sum of its proper divisors (1).

77636513 is an equidigital number, since it uses as much as digits as its factorization.

77636513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 79380, while the sum is 38.

The square root of 77636513 is about 8811.1584368913. The cubic root of 77636513 is about 426.6011354299.

The spelling of 77636513 in words is "seventy-seven million, six hundred thirty-six thousand, five hundred thirteen".