90978001 has 8 divisors (see below), whose sum is σ = 91881504. Its totient is φ = 90078240.

The previous prime is 90977993. The next prime is 90978007. The reversal of 90978001 is 10087909.

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

It is a cyclic number.

It is not a de Polignac number, because 90978001 - 2³ = 90977993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90978007) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77646 + ... + 78808.

It is an arithmetic number, because the mean of its divisors is an integer number (11485188).

Almost surely, 2^90978001 is an apocalyptic number.

It is an amenable number.

90978001 is a deficient number, since it is larger than the sum of its proper divisors (903503).

90978001 is a wasteful number, since it uses less digits than its factorization.

90978001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1871.

The product of its (nonzero) digits is 4536, while the sum is 34.

The square root of 90978001 is about 9538.2388835676. The cubic root of 90978001 is about 449.7578961068.

The spelling of 90978001 in words is "ninety million, nine hundred seventy-eight thousand, one".