90701978 has 4 divisors (see below), whose sum is σ = 136052970. Its totient is φ = 45350988.

The previous prime is 90701977. The next prime is 90701993. The reversal of 90701978 is 87910709.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87910709 = 71 ⋅1238179.

It can be written as a sum of positive squares in only one way, i.e., 74356129 + 16345849 = 8623^2 + 4043^2 .

It is a super-2 number, since 2×90701978² = 16453697626224968, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (90701977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22675493 + ... + 22675496.

Almost surely, 2^90701978 is an apocalyptic number.

90701978 is a deficient number, since it is larger than the sum of its proper divisors (45350992).

90701978 is a wasteful number, since it uses less digits than its factorization.

90701978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45350991.

The product of its (nonzero) digits is 31752, while the sum is 41.

The square root of 90701978 is about 9523.7586067687. The cubic root of 90701978 is about 449.3025871934.

The spelling of 90701978 in words is "ninety million, seven hundred one thousand, nine hundred seventy-eight".