90478769 has 2 divisors, whose sum is σ = 90478770. Its totient is φ = 90478768.

The previous prime is 90478721. The next prime is 90478781. The reversal of 90478769 is 96787409.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 90478144 + 625 = 9512^2 + 25^2 .

It is a cyclic number.

It is not a de Polignac number, because 90478769 - 2¹⁶ = 90413233 is a prime.

It is a super-2 number, since 2×90478769² = 16372815279510722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (90478169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45239384 + 45239385.

It is an arithmetic number, because the mean of its divisors is an integer number (45239385).

Almost surely, 2^90478769 is an apocalyptic number.

It is an amenable number.

90478769 is a deficient number, since it is larger than the sum of its proper divisors (1).

90478769 is an equidigital number, since it uses as much as digits as its factorization.

90478769 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 762048, while the sum is 50.

The square root of 90478769 is about 9512.0328531813. The cubic root of 90478769 is about 448.9337207041.

The spelling of 90478769 in words is "ninety million, four hundred seventy-eight thousand, seven hundred sixty-nine".