61660487 has 16 divisors (see below), whose sum is σ = 72161280. Its totient is φ = 51595872.

The previous prime is 61660481. The next prime is 61660507. The reversal of 61660487 is 78406616.

It is a cyclic number.

It is not a de Polignac number, because 61660487 - 2⁴ = 61660471 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61660487.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61660481) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71018 + ... + 71880.

It is an arithmetic number, because the mean of its divisors is an integer number (4510080).

Almost surely, 2^61660487 is an apocalyptic number.

61660487 is a deficient number, since it is larger than the sum of its proper divisors (10500793).

61660487 is a wasteful number, since it uses less digits than its factorization.

61660487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1102.

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 61660487 is about 7852.4191813733. The cubic root of 61660487 is about 395.0653889505.

The spelling of 61660487 in words is "sixty-one million, six hundred sixty thousand, four hundred eighty-seven".