78173648 has 20 divisors (see below), whose sum is σ = 173099040. Its totient is φ = 33502944.

The previous prime is 78173639. The next prime is 78173653. The reversal of 78173648 is 84637187.

It is a super-2 number, since 2×78173648² = 12222238483255808, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78173599 and 78173608.

It is a congruent number.

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, 348878 + ... + 349101.

It is an arithmetic number, because the mean of its divisors is an integer number (8654952).

Almost surely, 2^78173648 is an apocalyptic number.

It is an amenable number.

78173648 is an abundant number, since it is smaller than the sum of its proper divisors (94925392).

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

78173648 is a wasteful number, since it uses less digits than its factorization.

78173648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 697994 (or 697988 counting only the distinct ones).

The product of its digits is 225792, while the sum is 44.

The square root of 78173648 is about 8841.5862830151. The cubic root of 78173648 is about 427.5827009616.

The spelling of 78173648 in words is "seventy-eight million, one hundred seventy-three thousand, six hundred forty-eight".