91378238 has 12 divisors (see below), whose sum is σ = 159445872. Its totient is φ = 39162060.

The previous prime is 91378223. The next prime is 91378249. The reversal of 91378238 is 83287319.

It is a junction number, because it is equal to n+sod(n) for n = 91378195 and 91378204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 466118 + ... + 466313.

It is an arithmetic number, because the mean of its divisors is an integer number (13287156).

Almost surely, 2^91378238 is an apocalyptic number.

91378238 is a gapful number since it is divisible by the number (98) formed by its first and last digit.

91378238 is a deficient number, since it is larger than the sum of its proper divisors (68067634).

91378238 is a wasteful number, since it uses less digits than its factorization.

91378238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 932447 (or 932440 counting only the distinct ones).

The product of its digits is 72576, while the sum is 41.

The square root of 91378238 is about 9559.1965143520. The cubic root of 91378238 is about 450.4164671230.

The spelling of 91378238 in words is "ninety-one million, three hundred seventy-eight thousand, two hundred thirty-eight".