91420450 has 24 divisors (see below), whose sum is σ = 185501520. Its totient is φ = 33243600.

The previous prime is 91420409. The next prime is 91420471. The reversal of 91420450 is 5402419.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 82560 + ... + 83659.

It is an arithmetic number, because the mean of its divisors is an integer number (7729230).

Almost surely, 2^91420450 is an apocalyptic number.

91420450 is an abundant number, since it is smaller than the sum of its proper divisors (94081070).

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

91420450 is a wasteful number, since it uses less digits than its factorization.

91420450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166242 (or 166237 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 91420450 is about 9561.4041855786. The cubic root of 91420450 is about 450.4858127841.

Adding to 91420450 its reverse (5402419), we get a palindrome (96822869).

The spelling of 91420450 in words is "ninety-one million, four hundred twenty thousand, four hundred fifty".