91628783 has 2 divisors, whose sum is σ = 91628784. Its totient is φ = 91628782.

The previous prime is 91628753. The next prime is 91628833. The reversal of 91628783 is 38782619.

It is a weak prime.

It is an emirp because it is prime and its reverse (38782619) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91628783 - 2²⁰ = 90580207 is a prime.

It is a super-2 number, since 2×91628783² = 16791667748122178, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91628723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45814391 + 45814392.

It is an arithmetic number, because the mean of its divisors is an integer number (45814392).

Almost surely, 2^91628783 is an apocalyptic number.

91628783 is a deficient number, since it is larger than the sum of its proper divisors (1).

91628783 is an equidigital number, since it uses as much as digits as its factorization.

91628783 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145152, while the sum is 44.

The square root of 91628783 is about 9572.2924631459. The cubic root of 91628783 is about 450.8277488983.

The spelling of 91628783 in words is "ninety-one million, six hundred twenty-eight thousand, seven hundred eighty-three".