78102851 has 4 divisors (see below), whose sum is σ = 78453312. Its totient is φ = 77752392.

The previous prime is 78102839. The next prime is 78102853. The reversal of 78102851 is 15820187.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 78102851 - 2¹⁴ = 78086467 is a prime.

It is a super-2 number, since 2×78102851² = 12200110668656402, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78102853) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 174896 + ... + 175341.

It is an arithmetic number, because the mean of its divisors is an integer number (19613328).

Almost surely, 2^78102851 is an apocalyptic number.

78102851 is a deficient number, since it is larger than the sum of its proper divisors (350461).

78102851 is a wasteful number, since it uses less digits than its factorization.

78102851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 350460.

The product of its (nonzero) digits is 4480, while the sum is 32.

The square root of 78102851 is about 8837.5817393674. The cubic root of 78102851 is about 427.4535836430.

The spelling of 78102851 in words is "seventy-eight million, one hundred two thousand, eight hundred fifty-one".