61688431 has 8 divisors (see below), whose sum is σ = 71467424. Its totient is φ = 52151040.

The previous prime is 61688401. The next prime is 61688437. The reversal of 61688431 is 13488616.

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

It is a cyclic number.

It is not a de Polignac number, because 61688431 - 2⁵ = 61688399 is a prime.

It is a super-2 number, since 2×61688431² = 7610925038483522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61688437) 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, 59850 + ... + 60871.

It is an arithmetic number, because the mean of its divisors is an integer number (8933428).

Almost surely, 2^61688431 is an apocalyptic number.

61688431 is a deficient number, since it is larger than the sum of its proper divisors (9778993).

61688431 is a wasteful number, since it uses less digits than its factorization.

61688431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120801.

The product of its digits is 27648, while the sum is 37.

The square root of 61688431 is about 7854.1983040919. The cubic root of 61688431 is about 395.1250600110.

The spelling of 61688431 in words is "sixty-one million, six hundred eighty-eight thousand, four hundred thirty-one".