78270861 has 8 divisors (see below), whose sum is σ = 109853920. Its totient is φ = 49434192.

The previous prime is 78270809. The next prime is 78270887. The reversal of 78270861 is 16807287.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 78270861 - 2⁷ = 78270733 is a prime.

It is a super-2 number, since 2×78270861² = 12252655363362642, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78270161) 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, 686530 + ... + 686643.

It is an arithmetic number, because the mean of its divisors is an integer number (13731740).

Almost surely, 2^78270861 is an apocalyptic number.

It is an amenable number.

78270861 is a deficient number, since it is larger than the sum of its proper divisors (31583059).

78270861 is a wasteful number, since it uses less digits than its factorization.

78270861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1373195.

The product of its (nonzero) digits is 37632, while the sum is 39.

The square root of 78270861 is about 8847.0820613353. The cubic root of 78270861 is about 427.7598679908.

The spelling of 78270861 in words is "seventy-eight million, two hundred seventy thousand, eight hundred sixty-one".