78500749 has 2 divisors, whose sum is σ = 78500750. Its totient is φ = 78500748.

The previous prime is 78500743. The next prime is 78500797. The reversal of 78500749 is 94700587.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55026724 + 23474025 = 7418^2 + 4845^2 .

It is an emirp because it is prime and its reverse (94700587) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78500749 is a prime.

It is a super-2 number, since 2×78500749² = 12324735187122002, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78500743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39250374 + 39250375.

It is an arithmetic number, because the mean of its divisors is an integer number (39250375).

Almost surely, 2^78500749 is an apocalyptic number.

It is an amenable number.

78500749 is a deficient number, since it is larger than the sum of its proper divisors (1).

78500749 is an equidigital number, since it uses as much as digits as its factorization.

78500749 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 70560, while the sum is 40.

The square root of 78500749 is about 8860.0648417492. The cubic root of 78500749 is about 428.1782473705.

The spelling of 78500749 in words is "seventy-eight million, five hundred thousand, seven hundred forty-nine".