78689261 has 8 divisors (see below), whose sum is σ = 90941760. Its totient is φ = 66689568.

The previous prime is 78689257. The next prime is 78689287. The reversal of 78689261 is 16298687.

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 78689261 - 2² = 78689257 is a prime.

It is a super-2 number, since 2×78689261² = 12383999593452242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78689161) 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, 62531 + ... + 63776.

It is an arithmetic number, because the mean of its divisors is an integer number (11367720).

Almost surely, 2^78689261 is an apocalyptic number.

It is an amenable number.

78689261 is a deficient number, since it is larger than the sum of its proper divisors (12252499).

78689261 is a wasteful number, since it uses less digits than its factorization.

78689261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126403.

The product of its digits is 290304, while the sum is 47.

The square root of 78689261 is about 8870.6967595562. The cubic root of 78689261 is about 428.5207163434.

The spelling of 78689261 in words is "seventy-eight million, six hundred eighty-nine thousand, two hundred sixty-one".