90428385477 has 4 divisors (see below), whose sum is σ = 120571180640. Its totient is φ = 60285590316.

The previous prime is 90428385451. The next prime is 90428385479. The reversal of 90428385477 is 77458382409.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 90428385477 - 2¹⁵ = 90428352709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90428385479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15071397577 + ... + 15071397582.

It is an arithmetic number, because the mean of its divisors is an integer number (30142795160).

Almost surely, 2^90428385477 is an apocalyptic number.

It is an amenable number.

90428385477 is a deficient number, since it is larger than the sum of its proper divisors (30142795163).

90428385477 is a wasteful number, since it uses less digits than its factorization.

90428385477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30142795162.

The product of its (nonzero) digits is 13547520, while the sum is 57.

The spelling of 90428385477 in words is "ninety billion, four hundred twenty-eight million, three hundred eighty-five thousand, four hundred seventy-seven".