78244720 has 40 divisors (see below), whose sum is σ = 182756160. Its totient is φ = 31153920.

The previous prime is 78244667. The next prime is 78244721. The reversal of 78244720 is 2744287.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×78244720² = 12244472415756800, which contains 22 as substring.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78244721) 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, 16185 + ... + 20455.

It is an arithmetic number, because the mean of its divisors is an integer number (4568904).

Almost surely, 2^78244720 is an apocalyptic number.

It is an amenable number.

78244720 is an abundant number, since it is smaller than the sum of its proper divisors (104511440).

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

78244720 is a wasteful number, since it uses less digits than its factorization.

78244720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4513 (or 4507 counting only the distinct ones).

The product of its (nonzero) digits is 25088, while the sum is 34.

The square root of 78244720 is about 8845.6045581973. The cubic root of 78244720 is about 427.7122414298.

It can be divided in two parts, 7824 and 4720, that added together give a square (12544 = 112²).

The spelling of 78244720 in words is "seventy-eight million, two hundred forty-four thousand, seven hundred twenty".