1020717978 has 64 divisors (see below), whose sum is σ = 2474634240. Its totient is φ = 273998592.

The previous prime is 1020717967. The next prime is 1020717979. The reversal of 1020717978 is 8797170201.

It is a super-2 number, since 2×1020717978² = 2083730381224816968, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (1020717979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 629653 + ... + 631271.

It is an arithmetic number, because the mean of its divisors is an integer number (38666160).

Almost surely, 2^1020717978 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1020717978, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1237317120).

1020717978 is an abundant number, since it is smaller than the sum of its proper divisors (1453916262).

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

1020717978 is a wasteful number, since it uses less digits than its factorization.

1020717978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2531.

The product of its (nonzero) digits is 49392, while the sum is 42.

The square root of 1020717978 is about 31948.6772496140. The cubic root of 1020717978 is about 1006.8588414061.

The spelling of 1020717978 in words is "one billion, twenty million, seven hundred seventeen thousand, nine hundred seventy-eight".