61387689 has 24 divisors (see below), whose sum is σ = 94256352. Its totient is φ = 35239680.

The previous prime is 61387679. The next prime is 61387721. The reversal of 61387689 is 98678316.

It is not a de Polignac number, because 61387689 - 2⁴ = 61387673 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (61387649) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9337 + ... + 14489.

It is an arithmetic number, because the mean of its divisors is an integer number (3927348).

Almost surely, 2^61387689 is an apocalyptic number.

It is an amenable number.

61387689 is a deficient number, since it is larger than the sum of its proper divisors (32868663).

61387689 is a wasteful number, since it uses less digits than its factorization.

61387689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5205 (or 5186 counting only the distinct ones).

The product of its digits is 435456, while the sum is 48.

The square root of 61387689 is about 7835.0296106652. The cubic root of 61387689 is about 394.4819122307.

The spelling of 61387689 in words is "sixty-one million, three hundred eighty-seven thousand, six hundred eighty-nine".