78240851 has 8 divisors (see below), whose sum is σ = 89216064. Its totient is φ = 67973760.

The previous prime is 78240847. The next prime is 78240859. The reversal of 78240851 is 15804287.

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 78240851 - 2² = 78240847 is a prime.

It is a super-2 number, since 2×78240851² = 12243261530408402, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78240859) 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, 176795 + ... + 177236.

It is an arithmetic number, because the mean of its divisors is an integer number (11152008).

Almost surely, 2^78240851 is an apocalyptic number.

78240851 is a deficient number, since it is larger than the sum of its proper divisors (10975213).

78240851 is a wasteful number, since it uses less digits than its factorization.

78240851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 354061.

The product of its (nonzero) digits is 17920, while the sum is 35.

The square root of 78240851 is about 8845.3858593054. The cubic root of 78240851 is about 427.7051915571.

The spelling of 78240851 in words is "seventy-eight million, two hundred forty thousand, eight hundred fifty-one".