78728450 has 12 divisors (see below), whose sum is σ = 146435010. Its totient is φ = 31491360.

The previous prime is 78728423. The next prime is 78728483. The reversal of 78728450 is 5482787.

It can be written as a sum of positive squares in 3 ways, for example, as 66569281 + 12159169 = 8159^2 + 3487^2 .

It is a junction number, because it is equal to n+sod(n) for n = 78728398 and 78728407.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 787235 + ... + 787334.

Almost surely, 2^78728450 is an apocalyptic number.

78728450 is a deficient number, since it is larger than the sum of its proper divisors (67706560).

78728450 is a wasteful number, since it uses less digits than its factorization.

78728450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1574581 (or 1574576 counting only the distinct ones).

The product of its (nonzero) digits is 125440, while the sum is 41.

The square root of 78728450 is about 8872.9053866251. The cubic root of 78728450 is about 428.5918421493.

The spelling of 78728450 in words is "seventy-eight million, seven hundred twenty-eight thousand, four hundred fifty".