78909450 has 24 divisors (see below), whose sum is σ = 195695808. Its totient is φ = 21042480.

The previous prime is 78909449. The next prime is 78909469. The reversal of 78909450 is 5490987.

It is an alternating number because its digits alternate between odd and even.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 262882 + ... + 263181.

It is an arithmetic number, because the mean of its divisors is an integer number (8153992).

Almost surely, 2^78909450 is an apocalyptic number.

78909450 is an abundant number, since it is smaller than the sum of its proper divisors (116786358).

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

78909450 is a wasteful number, since it uses less digits than its factorization.

78909450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 526078 (or 526073 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 42.

The square root of 78909450 is about 8883.0991213652. The cubic root of 78909450 is about 428.9200409549.

The spelling of 78909450 in words is "seventy-eight million, nine hundred nine thousand, four hundred fifty".