91748739 has 8 divisors (see below), whose sum is σ = 128770240. Its totient is φ = 57946536.

The previous prime is 91748729. The next prime is 91748753. The reversal of 91748739 is 93784719.

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

It is not a de Polignac number, because 91748739 - 2⁵ = 91748707 is a prime.

It is a super-2 number, since 2×91748739² = 16835662216180242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91748729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 804757 + ... + 804870.

It is an arithmetic number, because the mean of its divisors is an integer number (16096280).

Almost surely, 2^91748739 is an apocalyptic number.

91748739 is a deficient number, since it is larger than the sum of its proper divisors (37021501).

91748739 is a wasteful number, since it uses less digits than its factorization.

91748739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1609649.

The product of its digits is 381024, while the sum is 48.

The square root of 91748739 is about 9578.5562064436. The cubic root of 91748739 is about 451.0243971181.

The spelling of 91748739 in words is "ninety-one million, seven hundred forty-eight thousand, seven hundred thirty-nine".