78403648 has 28 divisors (see below), whose sum is σ = 155928060. Its totient is φ = 39114752.

The previous prime is 78403627. The next prime is 78403673. The reversal of 78403648 is 84630487.

It can be written as a sum of positive squares in 2 ways, for example, as 9048064 + 69355584 = 3008^2 + 8328^2 .

It is a super-2 number, since 2×78403648² = 12294264039415808, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78403648.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35340 + ... + 37492.

Almost surely, 2^78403648 is an apocalyptic number.

It is an amenable number.

78403648 is a deficient number, since it is larger than the sum of its proper divisors (77524412).

78403648 is a wasteful number, since it uses less digits than its factorization.

78403648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2734 (or 2724 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 40.

The square root of 78403648 is about 8854.5834458771. The cubic root of 78403648 is about 428.0016304127.

The spelling of 78403648 in words is "seventy-eight million, four hundred three thousand, six hundred forty-eight".