90978242 has 8 divisors (see below), whose sum is σ = 140869632. Its totient is φ = 44021700.

The previous prime is 90978233. The next prime is 90978253. The reversal of 90978242 is 24287909.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 90978242.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 733634 + ... + 733757.

It is an arithmetic number, because the mean of its divisors is an integer number (17608704).

Almost surely, 2^90978242 is an apocalyptic number.

90978242 is a deficient number, since it is larger than the sum of its proper divisors (49891390).

90978242 is a wasteful number, since it uses less digits than its factorization.

90978242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1467424.

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 90978242 is about 9538.2515169186. The cubic root of 90978242 is about 449.7582932415.

The spelling of 90978242 in words is "ninety million, nine hundred seventy-eight thousand, two hundred forty-two".