61578142 has 4 divisors (see below), whose sum is σ = 92367216. Its totient is φ = 30789070.

The previous prime is 61578119. The next prime is 61578161. The reversal of 61578142 is 24187516.

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

It is a junction number, because it is equal to n+sod(n) for n = 61578098 and 61578107.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15394534 + ... + 15394537.

It is an arithmetic number, because the mean of its divisors is an integer number (23091804).

Almost surely, 2^61578142 is an apocalyptic number.

61578142 is a deficient number, since it is larger than the sum of its proper divisors (30789074).

61578142 is a wasteful number, since it uses less digits than its factorization.

61578142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30789073.

The product of its digits is 13440, while the sum is 34.

The square root of 61578142 is about 7847.1741410523. The cubic root of 61578142 is about 394.8894461744.

The spelling of 61578142 in words is "sixty-one million, five hundred seventy-eight thousand, one hundred forty-two".