90278737 has 4 divisors (see below), whose sum is σ = 90391140. Its totient is φ = 90166336.

The previous prime is 90278729. The next prime is 90278743. The reversal of 90278737 is 73787209.

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

It can be written as a sum of positive squares in 2 ways, for example, as 83010321 + 7268416 = 9111^2 + 2696^2 .

It is a cyclic number.

It is not a de Polignac number, because 90278737 - 2³ = 90278729 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 90278693 and 90278702.

It is not an unprimeable number, because it can be changed into a prime (90278717) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54988 + ... + 56605.

It is an arithmetic number, because the mean of its divisors is an integer number (22597785).

Almost surely, 2^90278737 is an apocalyptic number.

It is an amenable number.

90278737 is a deficient number, since it is larger than the sum of its proper divisors (112403).

90278737 is a wasteful number, since it uses less digits than its factorization.

90278737 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112402.

The product of its (nonzero) digits is 148176, while the sum is 43.

The square root of 90278737 is about 9501.5123533046. The cubic root of 90278737 is about 448.6026398315.

The spelling of 90278737 in words is "ninety million, two hundred seventy-eight thousand, seven hundred thirty-seven".