90451378 has 4 divisors (see below), whose sum is σ = 135677070. Its totient is φ = 45225688.

The previous prime is 90451369. The next prime is 90451393. The reversal of 90451378 is 87315409.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87315409 = 101 ⋅864509.

It can be written as a sum of positive squares in only one way, i.e., 45333289 + 45118089 = 6733^2 + 6717^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22612843 + ... + 22612846.

Almost surely, 2^90451378 is an apocalyptic number.

90451378 is a deficient number, since it is larger than the sum of its proper divisors (45225692).

90451378 is a wasteful number, since it uses less digits than its factorization.

90451378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45225691.

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 90451378 is about 9510.5929363000. The cubic root of 90451378 is about 448.8884136309. Note that the first 3 decimals are identical.

The spelling of 90451378 in words is "ninety million, four hundred fifty-one thousand, three hundred seventy-eight".