78213648 has 20 divisors (see below), whose sum is σ = 202052048. Its totient is φ = 26071200.

The previous prime is 78213643. The next prime is 78213659. The reversal of 78213648 is 84631287.

It is a super-2 number, since 2×78213648² = 12234749466935808, which contains 22 as substring.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (78213643) 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, 814678 + ... + 814773.

Almost surely, 2^78213648 is an apocalyptic number.

It is an amenable number.

78213648 is an abundant number, since it is smaller than the sum of its proper divisors (123838400).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78213648 is a wasteful number, since it uses less digits than its factorization.

78213648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1629462 (or 1629456 counting only the distinct ones).

The product of its digits is 64512, while the sum is 39.

The square root of 78213648 is about 8843.8480312588. The cubic root of 78213648 is about 427.6556172284.

The spelling of 78213648 in words is "seventy-eight million, two hundred thirteen thousand, six hundred forty-eight".