78244380 has 60 divisors (see below), whose sum is σ = 245460600. Its totient is φ = 20864736.

The previous prime is 78244379. The next prime is 78244427. The reversal of 78244380 is 8344287.

It is a tau number, because it is divible by the number of its divisors (60).

It is a super-2 number, since 2×78244380² = 12244366003168800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 22530 + ... + 25769.

It is an arithmetic number, because the mean of its divisors is an integer number (4091010).

Almost surely, 2^78244380 is an apocalyptic number.

It is an amenable number.

78244380 is an abundant number, since it is smaller than the sum of its proper divisors (167216220).

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

78244380 is a wasteful number, since it uses less digits than its factorization.

78244380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48320 (or 48309 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 36.

The square root of 78244380 is about 8845.5853395917. The cubic root of 78244380 is about 427.7116219103.

The spelling of 78244380 in words is "seventy-eight million, two hundred forty-four thousand, three hundred eighty".