75731731 has 4 divisors (see below), whose sum is σ = 78343200. Its totient is φ = 73120264.

The previous prime is 75731717. The next prime is 75731741. The reversal of 75731731 is 13713757.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 75731731 - 2⁵ = 75731699 is a prime.

It is a super-2 number, since 2×75731731² = 11470590160512722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (75731741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1305691 + ... + 1305748.

It is an arithmetic number, because the mean of its divisors is an integer number (19585800).

Almost surely, 2^75731731 is an apocalyptic number.

75731731 is a deficient number, since it is larger than the sum of its proper divisors (2611469).

75731731 is a wasteful number, since it uses less digits than its factorization.

75731731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2611468.

The product of its digits is 15435, while the sum is 34.

The square root of 75731731 is about 8702.3980028496. The cubic root of 75731731 is about 423.0833760465.

The spelling of 75731731 in words is "seventy-five million, seven hundred thirty-one thousand, seven hundred thirty-one".