78723420 has 48 divisors (see below), whose sum is σ = 226389408. Its totient is φ = 20424960.

The previous prime is 78723401. The next prime is 78723433. The reversal of 78723420 is 2432787.

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 15 ways as a sum of consecutive naturals, for example, 15511 + ... + 19950.

It is an arithmetic number, because the mean of its divisors is an integer number (4716446).

Almost surely, 2^78723420 is an apocalyptic number.

It is an amenable number.

78723420 is an abundant number, since it is smaller than the sum of its proper divisors (147665988).

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

78723420 is a wasteful number, since it uses less digits than its factorization.

78723420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35510 (or 35508 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 33.

The square root of 78723420 is about 8872.6219349187. The cubic root of 78723420 is about 428.5827143060.

The spelling of 78723420 in words is "seventy-eight million, seven hundred twenty-three thousand, four hundred twenty".