78771628 has 24 divisors (see below), whose sum is σ = 149141888. Its totient is φ = 36187776.

The previous prime is 78771613. The next prime is 78771643. The reversal of 78771628 is 82617787.

It is an interprime number because it is at equal distance from previous prime (78771613) and next prime (78771643).

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, 8200 + ... + 14992.

Almost surely, 2^78771628 is an apocalyptic number.

It is an amenable number.

78771628 is a deficient number, since it is larger than the sum of its proper divisors (70370260).

78771628 is a wasteful number, since it uses less digits than its factorization.

78771628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7033 (or 7031 counting only the distinct ones).

The product of its digits is 263424, while the sum is 46.

The square root of 78771628 is about 8875.3381907396. The cubic root of 78771628 is about 428.6701804395.

The spelling of 78771628 in words is "seventy-eight million, seven hundred seventy-one thousand, six hundred twenty-eight".