61278823 has 4 divisors (see below), whose sum is σ = 61517520. Its totient is φ = 61040128.

The previous prime is 61278809. The next prime is 61278869. The reversal of 61278823 is 32887216.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61278823 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61278023) 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, 118963 + ... + 119476.

It is an arithmetic number, because the mean of its divisors is an integer number (15379380).

Almost surely, 2^61278823 is an apocalyptic number.

61278823 is a deficient number, since it is larger than the sum of its proper divisors (238697).

61278823 is a wasteful number, since it uses less digits than its factorization.

61278823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238696.

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

The square root of 61278823 is about 7828.0791385882. The cubic root of 61278823 is about 394.2485805401.

The spelling of 61278823 in words is "sixty-one million, two hundred seventy-eight thousand, eight hundred twenty-three".