820998915 has 96 divisors (see below), whose sum is σ = 1533385728. Its totient is φ = 374035200.

The previous prime is 820998881. The next prime is 820998917. The reversal of 820998915 is 519899028.

It is not a de Polignac number, because 820998915 - 2¹² = 820994819 is a prime.

It is a super-3 number, since 3×820998915³ (a number of 28 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (820998917) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2963757 + ... + 2964033.

It is an arithmetic number, because the mean of its divisors is an integer number (15972768).

Almost surely, 2^820998915 is an apocalyptic number.

820998915 is a deficient number, since it is larger than the sum of its proper divisors (712386813).

820998915 is a wasteful number, since it uses less digits than its factorization.

820998915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401 (or 390 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 51.

The square root of 820998915 is about 28653.0786304020. The cubic root of 820998915 is about 936.3700790666.

The spelling of 820998915 in words is "eight hundred twenty million, nine hundred ninety-eight thousand, nine hundred fifteen".