78751409 has 8 divisors (see below), whose sum is σ = 90432480. Its totient is φ = 67824000.

The previous prime is 78751403. The next prime is 78751411. The reversal of 78751409 is 90415787.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78751409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78751403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 188192 + ... + 188609.

It is an arithmetic number, because the mean of its divisors is an integer number (11304060).

Almost surely, 2^78751409 is an apocalyptic number.

It is an amenable number.

78751409 is a deficient number, since it is larger than the sum of its proper divisors (11681071).

78751409 is a wasteful number, since it uses less digits than its factorization.

78751409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 376831.

The product of its (nonzero) digits is 70560, while the sum is 41.

The square root of 78751409 is about 8874.1990624507. The cubic root of 78751409 is about 428.6335004644.

The spelling of 78751409 in words is "seventy-eight million, seven hundred fifty-one thousand, four hundred nine".