90978803 has 4 divisors (see below), whose sum is σ = 91223088. Its totient is φ = 90734520.

The previous prime is 90978787. The next prime is 90978827. The reversal of 90978803 is 30887909.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30887909 = 13 ⋅2375993.

It is a cyclic number.

It is not a de Polignac number, because 90978803 - 2⁴ = 90978787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90908803) 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, 121583 + ... + 122328.

It is an arithmetic number, because the mean of its divisors is an integer number (22805772).

Almost surely, 2^90978803 is an apocalyptic number.

90978803 is a deficient number, since it is larger than the sum of its proper divisors (244285).

90978803 is a wasteful number, since it uses less digits than its factorization.

90978803 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244284.

The product of its (nonzero) digits is 108864, while the sum is 44.

The square root of 90978803 is about 9538.2809247788. The cubic root of 90978803 is about 449.7592176892.

The spelling of 90978803 in words is "ninety million, nine hundred seventy-eight thousand, eight hundred three".