90770978 has 4 divisors (see below), whose sum is σ = 136156470. Its totient is φ = 45385488.

The previous prime is 90770971. The next prime is 90771049. The reversal of 90770978 is 87907709.

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., 74425129 + 16345849 = 8627^2 + 4043^2 .

It is not an unprimeable number, because it can be changed into a prime (90770971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22692743 + ... + 22692746.

Almost surely, 2^90770978 is an apocalyptic number.

90770978 is a deficient number, since it is larger than the sum of its proper divisors (45385492).

90770978 is a wasteful number, since it uses less digits than its factorization.

90770978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45385491.

The product of its (nonzero) digits is 222264, while the sum is 47.

The square root of 90770978 is about 9527.3804374550. The cubic root of 90770978 is about 449.4164914365.

The spelling of 90770978 in words is "ninety million, seven hundred seventy thousand, nine hundred seventy-eight".