90578434815777 has 4 divisors (see below), whose sum is σ = 120771246421040. Its totient is φ = 60385623210516.

The previous prime is 90578434815763. The next prime is 90578434815787. The reversal of 90578434815777 is 77751843487509.

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 90578434815777 - 2¹⁶ = 90578434750241 is a prime.

It is a super-2 number, since 2×90578434815777² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 90578434815699 and 90578434815708.

It is not an unprimeable number, because it can be changed into a prime (90578434815787) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15096405802627 + ... + 15096405802632.

It is an arithmetic number, because the mean of its divisors is an integer number (30192811605260).

Almost surely, 2^{90578434815777} is an apocalyptic number.

It is an amenable number.

90578434815777 is a deficient number, since it is larger than the sum of its proper divisors (30192811605263).

90578434815777 is a wasteful number, since it uses less digits than its factorization.

90578434815777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30192811605262.

The product of its (nonzero) digits is 1659571200, while the sum is 75.

The spelling of 90578434815777 in words is "ninety trillion, five hundred seventy-eight billion, four hundred thirty-four million, eight hundred fifteen thousand, seven hundred seventy-seven".