78275420 has 12 divisors (see below), whose sum is σ = 164378424. Its totient is φ = 31310160.

The previous prime is 78275419. The next prime is 78275423. The reversal of 78275420 is 2457287.

It is a super-2 number, since 2×78275420² = 12254082752352800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78275423) 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 3 ways as a sum of consecutive naturals, for example, 1956866 + ... + 1956905.

It is an arithmetic number, because the mean of its divisors is an integer number (13698202).

Almost surely, 2^78275420 is an apocalyptic number.

It is an amenable number.

78275420 is an abundant number, since it is smaller than the sum of its proper divisors (86103004).

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

78275420 is a wasteful number, since it uses less digits than its factorization.

78275420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3913780 (or 3913778 counting only the distinct ones).

The product of its (nonzero) digits is 31360, while the sum is 35.

The square root of 78275420 is about 8847.3397131567. The cubic root of 78275420 is about 427.7681729945.

The spelling of 78275420 in words is "seventy-eight million, two hundred seventy-five thousand, four hundred twenty".