91867540 has 12 divisors (see below), whose sum is σ = 192921876. Its totient is φ = 36747008.

The previous prime is 91867499. The next prime is 91867547. The reversal of 91867540 is 4576819.

It can be written as a sum of positive squares in 2 ways, for example, as 12194064 + 79673476 = 3492^2 + 8926^2 .

It is a junction number, because it is equal to n+sod(n) for n = 91867493 and 91867502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91867547) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2296669 + ... + 2296708.

It is an arithmetic number, because the mean of its divisors is an integer number (16076823).

Almost surely, 2^91867540 is an apocalyptic number.

It is an amenable number.

91867540 is an abundant number, since it is smaller than the sum of its proper divisors (101054336).

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

91867540 is a wasteful number, since it uses less digits than its factorization.

91867540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4593386 (or 4593384 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 91867540 is about 9584.7556046046. The cubic root of 91867540 is about 451.2189830406.

The spelling of 91867540 in words is "ninety-one million, eight hundred sixty-seven thousand, five hundred forty".