61129678 has 4 divisors (see below), whose sum is σ = 91694520. Its totient is φ = 30564838.

The previous prime is 61129639. The next prime is 61129681. The reversal of 61129678 is 87692116.

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

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 61129678.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15282418 + ... + 15282421.

It is an arithmetic number, because the mean of its divisors is an integer number (22923630).

Almost surely, 2^61129678 is an apocalyptic number.

61129678 is a deficient number, since it is larger than the sum of its proper divisors (30564842).

61129678 is a wasteful number, since it uses less digits than its factorization.

61129678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30564841.

The product of its digits is 36288, while the sum is 40.

The square root of 61129678 is about 7818.5470517226. The cubic root of 61129678 is about 393.9284700985.

The spelling of 61129678 in words is "sixty-one million, one hundred twenty-nine thousand, six hundred seventy-eight".