91649140 has 48 divisors (see below), whose sum is σ = 210611520. Its totient is φ = 33223680.

The previous prime is 91649119. The next prime is 91649147. The reversal of 91649140 is 4194619.

It is a junction number, because it is equal to n+sod(n) for n = 91649096 and 91649105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91649147) 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, 135844 + ... + 136516.

It is an arithmetic number, because the mean of its divisors is an integer number (4387740).

Almost surely, 2^91649140 is an apocalyptic number.

It is an amenable number.

91649140 is an abundant number, since it is smaller than the sum of its proper divisors (118962380).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91649140 is a wasteful number, since it uses less digits than its factorization.

91649140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1312 (or 1310 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 91649140 is about 9573.3557334928. The cubic root of 91649140 is about 450.8611329530.

The spelling of 91649140 in words is "ninety-one million, six hundred forty-nine thousand, one hundred forty".