78875551 has 8 divisors (see below), whose sum is σ = 80388864. Its totient is φ = 77374080.

The previous prime is 78875543. The next prime is 78875581. The reversal of 78875551 is 15557887.

It is a happy number.

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 78875551 - 2³ = 78875543 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78875521) 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, 11115 + ... + 16771.

It is an arithmetic number, because the mean of its divisors is an integer number (10048608).

Almost surely, 2^78875551 is an apocalyptic number.

78875551 is a deficient number, since it is larger than the sum of its proper divisors (1513313).

78875551 is a wasteful number, since it uses less digits than its factorization.

78875551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5921.

The product of its digits is 392000, while the sum is 46.

The square root of 78875551 is about 8881.1908548347. The cubic root of 78875551 is about 428.8586117131.

The spelling of 78875551 in words is "seventy-eight million, eight hundred seventy-five thousand, five hundred fifty-one".