61724631 has 16 divisors (see below), whose sum is σ = 83939328. Its totient is φ = 40336800.

The previous prime is 61724623. The next prime is 61724633. The reversal of 61724631 is 13642716.

It is not a de Polignac number, because 61724631 - 2³ = 61724623 is a prime.

It is a super-2 number, since 2×61724631² = 7619860144172322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61724633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41226 + ... + 42696.

It is an arithmetic number, because the mean of its divisors is an integer number (5246208).

Almost surely, 2^61724631 is an apocalyptic number.

61724631 is a deficient number, since it is larger than the sum of its proper divisors (22214697).

61724631 is a wasteful number, since it uses less digits than its factorization.

61724631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1742.

The product of its digits is 6048, while the sum is 30.

The square root of 61724631 is about 7856.5024661105. The cubic root of 61724631 is about 395.2023339827.

The spelling of 61724631 in words is "sixty-one million, seven hundred twenty-four thousand, six hundred thirty-one".