78085551 has 8 divisors (see below), whose sum is σ = 105821104. Its totient is φ = 51203520.

The previous prime is 78085547. The next prime is 78085561. The reversal of 78085551 is 15558087.

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

It is not a de Polignac number, because 78085551 - 2² = 78085547 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 (78085531) 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, 213166 + ... + 213531.

It is an arithmetic number, because the mean of its divisors is an integer number (13227638).

Almost surely, 2^78085551 is an apocalyptic number.

78085551 is a deficient number, since it is larger than the sum of its proper divisors (27735553).

78085551 is a wasteful number, since it uses less digits than its factorization.

78085551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 426761.

The product of its (nonzero) digits is 56000, while the sum is 39.

The square root of 78085551 is about 8836.6029106213. The cubic root of 78085551 is about 427.4220205909.

The spelling of 78085551 in words is "seventy-eight million, eighty-five thousand, five hundred fifty-one".