91945404 has 18 divisors (see below), whose sum is σ = 232417640. Its totient is φ = 30648456.

The previous prime is 91945397. The next prime is 91945409. The reversal of 91945404 is 40454919.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 2554039 = 91945404 / (9 + 1 + 9 + 4 + 5 + 4 + 0 + 4).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91945409) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1276984 + ... + 1277055.

Almost surely, 2^91945404 is an apocalyptic number.

It is an amenable number.

91945404 is an abundant number, since it is smaller than the sum of its proper divisors (140472236).

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

91945404 is a wasteful number, since it uses less digits than its factorization.

91945404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2554049 (or 2554044 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 91945404 is about 9588.8166110318. The cubic root of 91945404 is about 451.3464266530.

The spelling of 91945404 in words is "ninety-one million, nine hundred forty-five thousand, four hundred four".