78864072 has 32 divisors (see below), whose sum is σ = 225326400. Its totient is φ = 22532544.

The previous prime is 78864067. The next prime is 78864077. The reversal of 78864072 is 27046887.

It is an interprime number because it is at equal distance from previous prime (78864067) and next prime (78864077).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (78864077) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 234547 + ... + 234882.

It is an arithmetic number, because the mean of its divisors is an integer number (7041450).

Almost surely, 2^78864072 is an apocalyptic number.

It is an amenable number.

78864072 is an abundant number, since it is smaller than the sum of its proper divisors (146462328).

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

78864072 is a wasteful number, since it uses less digits than its factorization.

78864072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 469445 (or 469441 counting only the distinct ones).

The product of its (nonzero) digits is 150528, while the sum is 42.

The square root of 78864072 is about 8880.5445778961. The cubic root of 78864072 is about 428.8378063356.

The spelling of 78864072 in words is "seventy-eight million, eight hundred sixty-four thousand, seventy-two".