78747497 has 2 divisors, whose sum is σ = 78747498. Its totient is φ = 78747496.

The previous prime is 78747479. The next prime is 78747527. The reversal of 78747497 is 79474787.

Together with previous prime (78747479) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44302336 + 34445161 = 6656^2 + 5869^2 .

It is a cyclic number.

It is not a de Polignac number, because 78747497 - 2¹⁴ = 78731113 is a prime.

It is not a weakly prime, because it can be changed into another prime (78747407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39373748 + 39373749.

It is an arithmetic number, because the mean of its divisors is an integer number (39373749).

Almost surely, 2^78747497 is an apocalyptic number.

It is an amenable number.

78747497 is a deficient number, since it is larger than the sum of its proper divisors (1).

78747497 is an equidigital number, since it uses as much as digits as its factorization.

78747497 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2765952, while the sum is 53.

The square root of 78747497 is about 8873.9786454555. The cubic root of 78747497 is about 428.6264028474.

It can be divided in two parts, 787 and 47497, that added together give a palindrome (48284).

The spelling of 78747497 in words is "seventy-eight million, seven hundred forty-seven thousand, four hundred ninety-seven".