78851761 has 4 divisors (see below), whose sum is σ = 78984000. Its totient is φ = 78719524.

The previous prime is 78851741. The next prime is 78851779. The reversal of 78851761 is 16715887.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 78851761 - 2¹¹ = 78849713 is a prime.

It is a super-2 number, since 2×78851761² = 12435200425602242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78851741) 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, 65221 + ... + 66418.

It is an arithmetic number, because the mean of its divisors is an integer number (19746000).

Almost surely, 2^78851761 is an apocalyptic number.

It is an amenable number.

78851761 is a deficient number, since it is larger than the sum of its proper divisors (132239).

78851761 is a wasteful number, since it uses less digits than its factorization.

78851761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132238.

The product of its digits is 94080, while the sum is 43.

The square root of 78851761 is about 8879.8514064144. The cubic root of 78851761 is about 428.8154907368.

The spelling of 78851761 in words is "seventy-eight million, eight hundred fifty-one thousand, seven hundred sixty-one".