61573687 has 4 divisors (see below), whose sum is σ = 70369936. Its totient is φ = 52777440.

The previous prime is 61573679. The next prime is 61573693. The reversal of 61573687 is 78637516.

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

It is a cyclic number.

It is not a de Polignac number, because 61573687 - 2³ = 61573679 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61573637) 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, 4398114 + ... + 4398127.

It is an arithmetic number, because the mean of its divisors is an integer number (17592484).

Almost surely, 2^61573687 is an apocalyptic number.

61573687 is a deficient number, since it is larger than the sum of its proper divisors (8796249).

61573687 is an equidigital number, since it uses as much as digits as its factorization.

61573687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8796248.

The product of its digits is 211680, while the sum is 43.

The square root of 61573687 is about 7846.8902757717. The cubic root of 61573687 is about 394.8799229094.

The spelling of 61573687 in words is "sixty-one million, five hundred seventy-three thousand, six hundred eighty-seven".