91087380 has 72 divisors (see below), whose sum is σ = 277079712. Its totient is φ = 24221376.

The previous prime is 91087369. The next prime is 91087417. The reversal of 91087380 is 8378019.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 115347 + ... + 116133.

Almost surely, 2^91087380 is an apocalyptic number.

91087380 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

91087380 is an abundant number, since it is smaller than the sum of its proper divisors (185992332).

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

91087380 is a wasteful number, since it uses less digits than its factorization.

91087380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1445 (or 1440 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 91087380 is about 9543.9708717074. The cubic root of 91087380 is about 449.9380655503.

The spelling of 91087380 in words is "ninety-one million, eighty-seven thousand, three hundred eighty".