978428651 has 24 divisors (see below), whose sum is σ = 1043025984. Its totient is φ = 917527520.

The previous prime is 978428611. The next prime is 978428663. The reversal of 978428651 is 156824879.

It is not a de Polignac number, because 978428651 - 2⁶ = 978428587 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 978428651.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (978428611) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7468856 + ... + 7468986.

It is an arithmetic number, because the mean of its divisors is an integer number (43459416).

Almost surely, 2^978428651 is an apocalyptic number.

978428651 is a deficient number, since it is larger than the sum of its proper divisors (64597333).

978428651 is a wasteful number, since it uses less digits than its factorization.

978428651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 379 (or 350 counting only the distinct ones).

The product of its digits is 967680, while the sum is 50.

The square root of 978428651 is about 31279.8441652128. The cubic root of 978428651 is about 992.7572191052.

The spelling of 978428651 in words is "nine hundred seventy-eight million, four hundred twenty-eight thousand, six hundred fifty-one".