78709457 has 8 divisors (see below), whose sum is σ = 82975200. Its totient is φ = 74456064.

The previous prime is 78709447. The next prime is 78709487. The reversal of 78709457 is 75490787.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 78709457 - 2¹⁰ = 78708433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78709417) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11918 + ... + 17304.

It is an arithmetic number, because the mean of its divisors is an integer number (10371900).

Almost surely, 2^78709457 is an apocalyptic number.

It is an amenable number.

78709457 is a deficient number, since it is larger than the sum of its proper divisors (4265743).

78709457 is a wasteful number, since it uses less digits than its factorization.

78709457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6175.

The product of its (nonzero) digits is 493920, while the sum is 47.

The square root of 78709457 is about 8871.8350412978. The cubic root of 78709457 is about 428.5573738830.

The spelling of 78709457 in words is "seventy-eight million, seven hundred nine thousand, four hundred fifty-seven".