801498978 has 72 divisors (see below), whose sum is σ = 2048716800. Its totient is φ = 225756720.

The previous prime is 801498977. The next prime is 801498991. The reversal of 801498978 is 879894108.

801498978 is a `hidden beast` number, since 80 + 1 + 498 + 9 + 78 = 666.

It is a super-2 number, since 2×801498978² = 1284801223470088968, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (801498977) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 56223 + ... + 69021.

It is an arithmetic number, because the mean of its divisors is an integer number (28454400).

Almost surely, 2^801498978 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 801498978, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1024358400).

801498978 is an abundant number, since it is smaller than the sum of its proper divisors (1247217822).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

801498978 is a wasteful number, since it uses less digits than its factorization.

801498978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12892 (or 12882 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 54.

The square root of 801498978 is about 28310.7572841138. The cubic root of 801498978 is about 928.8972082644.

The spelling of 801498978 in words is "eight hundred one million, four hundred ninety-eight thousand, nine hundred seventy-eight".