90780946 has 4 divisors (see below), whose sum is σ = 136171422. Its totient is φ = 45390472.

The previous prime is 90780887. The next prime is 90780947. The reversal of 90780946 is 64908709.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 64883025 + 25897921 = 8055^2 + 5089^2 .

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 as a sum of consecutive naturals, namely, 22695235 + ... + 22695238.

Almost surely, 2^90780946 is an apocalyptic number.

90780946 is a deficient number, since it is larger than the sum of its proper divisors (45390476).

90780946 is a wasteful number, since it uses less digits than its factorization.

90780946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45390475.

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 90780946 is about 9527.9035469509. The cubic root of 90780946 is about 449.4329417003.

The spelling of 90780946 in words is "ninety million, seven hundred eighty thousand, nine hundred forty-six".