91970478 has 20 divisors (see below), whose sum is σ = 206082360. Its totient is φ = 30656772.

The previous prime is 91970471. The next prime is 91970497. The reversal of 91970478 is 87407919.

91970478 is a `hidden beast` number, since 91 + 97 + 0 + 478 = 666.

It is a super-3 number, since 3×91970478³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91970471) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 283698 + ... + 284021.

It is an arithmetic number, because the mean of its divisors is an integer number (10304118).

Almost surely, 2^91970478 is an apocalyptic number.

91970478 is an abundant number, since it is smaller than the sum of its proper divisors (114111882).

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

91970478 is a wasteful number, since it uses less digits than its factorization.

91970478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 567733 (or 567724 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 45.

The square root of 91970478 is about 9590.1239825145. The cubic root of 91970478 is about 451.3874511133.

The spelling of 91970478 in words is "ninety-one million, nine hundred seventy thousand, four hundred seventy-eight".