61687829 has 16 divisors (see below), whose sum is σ = 72780288. Its totient is φ = 51190272.

The previous prime is 61687819. The next prime is 61687907. The reversal of 61687829 is 92878616.

It is a de Polignac number, because none of the positive numbers 2^k-61687829 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61687819) 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, 30947 + ... + 32879.

It is an arithmetic number, because the mean of its divisors is an integer number (4548768).

Almost surely, 2^61687829 is an apocalyptic number.

It is an amenable number.

61687829 is a deficient number, since it is larger than the sum of its proper divisors (11092459).

61687829 is a wasteful number, since it uses less digits than its factorization.

61687829 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2084.

The product of its digits is 290304, while the sum is 47.

The square root of 61687829 is about 7854.1599805453. The cubic root of 61687829 is about 395.1237747021.

The spelling of 61687829 in words is "sixty-one million, six hundred eighty-seven thousand, eight hundred twenty-nine".