78461 has 4 divisors (see below), whose sum is σ = 81024. Its totient is φ = 75900.

The previous prime is 78439. The next prime is 78467. The reversal of 78461 is 16487.

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 a de Polignac number, because none of the positive numbers 2^k-78461 is a prime.

It is a super-2 number, since 2×78461² = 12312257042, which contains 22 as substring.

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 78461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78467) 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, 1235 + ... + 1296.

It is an arithmetic number, because the mean of its divisors is an integer number (20256).

2⁷⁸⁴⁶¹ is an apocalyptic number.

It is an amenable number.

78461 is a deficient number, since it is larger than the sum of its proper divisors (2563).

78461 is a wasteful number, since it uses less digits than its factorization.

78461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2562.

The product of its digits is 1344, while the sum is 26.

The square root of 78461 is about 280.1089073914. The cubic root of 78461 is about 42.8105965552.

Adding to 78461 its sum of digits (26), we get a palindrome (78487).

The spelling of 78461 in words is "seventy-eight thousand, four hundred sixty-one".