78045420 has 48 divisors (see below), whose sum is σ = 219098880. Its totient is φ = 20757696.

The previous prime is 78045403. The next prime is 78045421. The reversal of 78045420 is 2454087.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (78045421) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 24859 + ... + 27821.

It is an arithmetic number, because the mean of its divisors is an integer number (4564560).

Almost surely, 2^78045420 is an apocalyptic number.

It is an amenable number.

78045420 is an abundant number, since it is smaller than the sum of its proper divisors (141053460).

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

78045420 is a wasteful number, since it uses less digits than its factorization.

78045420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3414 (or 3412 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 30.

The square root of 78045420 is about 8834.3318932447. The cubic root of 78045420 is about 427.3487854780.

The spelling of 78045420 in words is "seventy-eight million, forty-five thousand, four hundred twenty".