91369440 has 144 divisors (see below), whose sum is σ = 315242928. Its totient is φ = 24096768.

The previous prime is 91369433. The next prime is 91369463. The reversal of 91369440 is 4496319.

It is a tau number, because it is divible by the number of its divisors (144).

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

It is a junction number, because it is equal to n+sod(n) for n = 91369395 and 91369404.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 153784 + ... + 154376.

It is an arithmetic number, because the mean of its divisors is an integer number (2189187).

Almost surely, 2^91369440 is an apocalyptic number.

91369440 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91369440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (157621464).

91369440 is an abundant number, since it is smaller than the sum of its proper divisors (223873488).

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

91369440 is a wasteful number, since it uses less digits than its factorization.

91369440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 721 (or 710 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The square root of 91369440 is about 9558.7363181542. The cubic root of 91369440 is about 450.4020111235.

It can be divided in two parts, 91369 and 440, that added together give a square (91809 = 303²).

The spelling of 91369440 in words is "ninety-one million, three hundred sixty-nine thousand, four hundred forty".