78460649 has 4 divisors (see below), whose sum is σ = 78711636. Its totient is φ = 78209664.

The previous prime is 78460621. The next prime is 78460651. The reversal of 78460649 is 94606487.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94606487 = 8999 ⋅10513.

It can be written as a sum of positive squares in 2 ways, for example, as 17073424 + 61387225 = 4132^2 + 7835^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78460649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78460549) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 125024 + ... + 125649.

It is an arithmetic number, because the mean of its divisors is an integer number (19677909).

Almost surely, 2^78460649 is an apocalyptic number.

It is an amenable number.

78460649 is a deficient number, since it is larger than the sum of its proper divisors (250987).

78460649 is a wasteful number, since it uses less digits than its factorization.

78460649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250986.

The product of its (nonzero) digits is 290304, while the sum is 44.

The square root of 78460649 is about 8857.8015895593. The cubic root of 78460649 is about 428.1053271654.

The spelling of 78460649 in words is "seventy-eight million, four hundred sixty thousand, six hundred forty-nine".