90780945 has 16 divisors (see below), whose sum is σ = 145478592. Its totient is φ = 48340160.

The previous prime is 90780887. The next prime is 90780947. The reversal of 90780945 is 54908709.

It is not a de Polignac number, because 90780945 - 2¹² = 90776849 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 90780897 and 90780906.

It is not an unprimeable number, because it can be changed into a prime (90780947) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5815 + ... + 14675.

It is an arithmetic number, because the mean of its divisors is an integer number (9092412).

Almost surely, 2^90780945 is an apocalyptic number.

It is an amenable number.

90780945 is a deficient number, since it is larger than the sum of its proper divisors (54697647).

90780945 is a wasteful number, since it uses less digits than its factorization.

90780945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9552.

The product of its (nonzero) digits is 90720, while the sum is 42.

The square root of 90780945 is about 9527.9034944735. The cubic root of 90780945 is about 449.4329400501.

The spelling of 90780945 in words is "ninety million, seven hundred eighty thousand, nine hundred forty-five".