78773720 has 16 divisors (see below), whose sum is σ = 177240960. Its totient is φ = 31509472.

The previous prime is 78773713. The next prime is 78773729. The reversal of 78773720 is 2737787.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78773729) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 984632 + ... + 984711.

It is an arithmetic number, because the mean of its divisors is an integer number (11077560).

Almost surely, 2^78773720 is an apocalyptic number.

It is an amenable number.

78773720 is an abundant number, since it is smaller than the sum of its proper divisors (98467240).

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

78773720 is a wasteful number, since it uses less digits than its factorization.

78773720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1969354 (or 1969350 counting only the distinct ones).

The product of its (nonzero) digits is 115248, while the sum is 41.

The square root of 78773720 is about 8875.4560446210. The cubic root of 78773720 is about 428.6739752495.

The spelling of 78773720 in words is "seventy-eight million, seven hundred seventy-three thousand, seven hundred twenty".