77320501 has 2 divisors, whose sum is σ = 77320502. Its totient is φ = 77320500.

The previous prime is 77320487. The next prime is 77320511. The reversal of 77320501 is 10502377.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43692100 + 33628401 = 6610^2 + 5799^2 .

It is a cyclic number.

It is not a de Polignac number, because 77320501 - 2⁵ = 77320469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77320511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38660250 + 38660251.

It is an arithmetic number, because the mean of its divisors is an integer number (38660251).

Almost surely, 2^77320501 is an apocalyptic number.

It is an amenable number.

77320501 is a deficient number, since it is larger than the sum of its proper divisors (1).

77320501 is an equidigital number, since it uses as much as digits as its factorization.

77320501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1470, while the sum is 25.

The square root of 77320501 is about 8793.2076627361. The cubic root of 77320501 is about 426.0215352761.

Adding to 77320501 its reverse (10502377), we get a palindrome (87822878).

The spelling of 77320501 in words is "seventy-seven million, three hundred twenty thousand, five hundred one".