91377928 has 8 divisors (see below), whose sum is σ = 171333630. Its totient is φ = 45688960.

The previous prime is 91377911. The next prime is 91377929. The reversal of 91377928 is 82977319.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 85414564 + 5963364 = 9242^2 + 2442^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (91377929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5711113 + ... + 5711128.

Almost surely, 2^91377928 is an apocalyptic number.

It is an amenable number.

91377928 is a deficient number, since it is larger than the sum of its proper divisors (79955702).

91377928 is a wasteful number, since it uses less digits than its factorization.

91377928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11422247 (or 11422243 counting only the distinct ones).

The product of its digits is 190512, while the sum is 46.

The square root of 91377928 is about 9559.1802995864. The cubic root of 91377928 is about 450.4159577775.

The spelling of 91377928 in words is "ninety-one million, three hundred seventy-seven thousand, nine hundred twenty-eight".