61729087 has 8 divisors (see below), whose sum is σ = 70824096. Its totient is φ = 52703232.

The previous prime is 61729039. The next prime is 61729111. The reversal of 61729087 is 78092716.

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

It is a cyclic number.

It is not a de Polignac number, because 61729087 - 2⁷ = 61728959 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61729007) 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, 15358 + ... + 18955.

It is an arithmetic number, because the mean of its divisors is an integer number (8853012).

Almost surely, 2^61729087 is an apocalyptic number.

61729087 is a deficient number, since it is larger than the sum of its proper divisors (9095009).

61729087 is a wasteful number, since it uses less digits than its factorization.

61729087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34577.

The product of its (nonzero) digits is 42336, while the sum is 40.

The square root of 61729087 is about 7856.7860477424. The cubic root of 61729087 is about 395.2118438504.

The spelling of 61729087 in words is "sixty-one million, seven hundred twenty-nine thousand, eighty-seven".