91487900 has 54 divisors (see below), whose sum is σ = 230953968. Its totient is φ = 31365600.

The previous prime is 91487899. The next prime is 91487909. The reversal of 91487900 is 978419.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91487909) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 4436 + ... + 14235.

Almost surely, 2^91487900 is an apocalyptic number.

It is an amenable number.

91487900 is an abundant number, since it is smaller than the sum of its proper divisors (139466068).

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

91487900 is a wasteful number, since it uses less digits than its factorization.

91487900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18699 (or 18685 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 91487900 is about 9564.9307368114. The cubic root of 91487900 is about 450.5965750129.

The spelling of 91487900 in words is "ninety-one million, four hundred eighty-seven thousand, nine hundred".