78771620 has 24 divisors (see below), whose sum is σ = 170757888. Its totient is φ = 30492000.

The previous prime is 78771613. The next prime is 78771643. The reversal of 78771620 is 2617787.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62906 + ... + 64145.

It is an arithmetic number, because the mean of its divisors is an integer number (7114912).

Almost surely, 2^78771620 is an apocalyptic number.

It is an amenable number.

78771620 is an abundant number, since it is smaller than the sum of its proper divisors (91986268).

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

78771620 is a wasteful number, since it uses less digits than its factorization.

78771620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127091 (or 127089 counting only the distinct ones).

The product of its (nonzero) digits is 32928, while the sum is 38.

The square root of 78771620 is about 8875.3377400525. The cubic root of 78771620 is about 428.6701659277.

The spelling of 78771620 in words is "seventy-eight million, seven hundred seventy-one thousand, six hundred twenty".