61887731 has 8 divisors (see below), whose sum is σ = 65971200. Its totient is φ = 57886920.

The previous prime is 61887719. The next prime is 61887739. The reversal of 61887731 is 13778816.

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

It is not a de Polignac number, because 61887731 - 2¹⁰ = 61886707 is a prime.

It is a super-2 number, since 2×61887731² = 7660182496656722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61887739) 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, 19115 + ... + 22116.

It is an arithmetic number, because the mean of its divisors is an integer number (8246400).

Almost surely, 2^61887731 is an apocalyptic number.

61887731 is a deficient number, since it is larger than the sum of its proper divisors (4083469).

61887731 is a wasteful number, since it uses less digits than its factorization.

61887731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41329.

The product of its digits is 56448, while the sum is 41.

The square root of 61887731 is about 7866.8755551362. The cubic root of 61887731 is about 395.5501195645.

The spelling of 61887731 in words is "sixty-one million, eight hundred eighty-seven thousand, seven hundred thirty-one".