978049840 has 80 divisors (see below), whose sum is σ = 2303959680. Its totient is φ = 386104320.

The previous prime is 978049829. The next prime is 978049847. The reversal of 978049840 is 48940879.

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (978049847) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3608905 + ... + 3609175.

It is an arithmetic number, because the mean of its divisors is an integer number (28799496).

Almost surely, 2^978049840 is an apocalyptic number.

It is an amenable number.

978049840 is an abundant number, since it is smaller than the sum of its proper divisors (1325909840).

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

978049840 is a wasteful number, since it uses less digits than its factorization.

978049840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 710 (or 704 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 49.

The square root of 978049840 is about 31273.7883858032. The cubic root of 978049840 is about 992.6290830720.

The spelling of 978049840 in words is "nine hundred seventy-eight million, forty-nine thousand, eight hundred forty".