978555651 has 64 divisors (see below), whose sum is σ = 1470873600. Its totient is φ = 576288000.

The previous prime is 978555619. The next prime is 978555653. The reversal of 978555651 is 156555879.

It is a happy number.

It is not a de Polignac number, because 978555651 - 2⁵ = 978555619 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 978555594 and 978555603.

It is not an unprimeable number, because it can be changed into a prime (978555653) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 6480426 + ... + 6480576.

It is an arithmetic number, because the mean of its divisors is an integer number (22982400).

Almost surely, 2^978555651 is an apocalyptic number.

978555651 is a deficient number, since it is larger than the sum of its proper divisors (492317949).

978555651 is a wasteful number, since it uses less digits than its factorization.

978555651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320.

The product of its digits is 1890000, while the sum is 51.

The square root of 978555651 is about 31281.8741606062. The cubic root of 978555651 is about 992.8001705294.

The spelling of 978555651 in words is "nine hundred seventy-eight million, five hundred fifty-five thousand, six hundred fifty-one".