978728516 has 6 divisors (see below), whose sum is σ = 1712774910. Its totient is φ = 489364256.

The previous prime is 978728483. The next prime is 978728537. The reversal of 978728516 is 615827879.

It can be written as a sum of positive squares in only one way, i.e., 524868100 + 453860416 = 22910^2 + 21304^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122341061 + ... + 122341068.

It is an arithmetic number, because the mean of its divisors is an integer number (285462485).

Almost surely, 2^978728516 is an apocalyptic number.

It is an amenable number.

978728516 is a deficient number, since it is larger than the sum of its proper divisors (734046394).

978728516 is a wasteful number, since it uses less digits than its factorization.

978728516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244682133 (or 244682131 counting only the distinct ones).

The product of its digits is 1693440, while the sum is 53.

The square root of 978728516 is about 31284.6370603848. The cubic root of 978728516 is about 992.8586275341.

The spelling of 978728516 in words is "nine hundred seventy-eight million, seven hundred twenty-eight thousand, five hundred sixteen".