91402388 has 48 divisors (see below), whose sum is σ = 209932800. Its totient is φ = 33734880.

The previous prime is 91402379. The next prime is 91402393. The reversal of 91402388 is 88320419.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1958 + ... + 13661.

It is an arithmetic number, because the mean of its divisors is an integer number (4373600).

Almost surely, 2^91402388 is an apocalyptic number.

It is an amenable number.

91402388 is an abundant number, since it is smaller than the sum of its proper divisors (118530412).

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

91402388 is a wasteful number, since it uses less digits than its factorization.

91402388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15660 (or 15658 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 91402388 is about 9560.4596123827. The cubic root of 91402388 is about 450.4561432348.

The spelling of 91402388 in words is "ninety-one million, four hundred two thousand, three hundred eighty-eight".