78430861 has 8 divisors (see below), whose sum is σ = 80679320. Its totient is φ = 76189248.

The previous prime is 78430853. The next prime is 78430901. The reversal of 78430861 is 16803487.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 26677225 + 51753636 = 5165^2 + 7194^2 .

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 78430861 - 2³ = 78430853 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78430861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78430361) 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, 29395 + ... + 31951.

It is an arithmetic number, because the mean of its divisors is an integer number (10084915).

Almost surely, 2^78430861 is an apocalyptic number.

It is an amenable number.

78430861 is a deficient number, since it is larger than the sum of its proper divisors (2248459).

78430861 is a wasteful number, since it uses less digits than its factorization.

78430861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3423.

The product of its (nonzero) digits is 32256, while the sum is 37.

The square root of 78430861 is about 8856.1199743454. The cubic root of 78430861 is about 428.0511428244.

The spelling of 78430861 in words is "seventy-eight million, four hundred thirty thousand, eight hundred sixty-one".