87078698281 has 9 divisors (see below), whose sum is σ = 87401836119. Its totient is φ = 86756754000.

The previous prime is 87078698279. The next prime is 87078698297. The reversal of 87078698281 is 18289687078.

The square root of 87078698281 is 295091.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 73192432681 + 13886265600 = 270541^2 + 117840^2 .

It is not a de Polignac number, because 87078698281 - 2¹ = 87078698279 is a prime.

It is a super-2 number, since 2×87078698281² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87078698081) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 144889381 + ... + 144889981.

Almost surely, 2^87078698281 is an apocalyptic number.

87078698281 is the 295091-st square number.

87078698281 is the 147546-th centered octagonal number.

It is an amenable number.

87078698281 is a deficient number, since it is larger than the sum of its proper divisors (323137838).

87078698281 is an frugal number, since it uses more digits than its factorization.

87078698281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2184 (or 1092 counting only the distinct ones).

The product of its (nonzero) digits is 21676032, while the sum is 64.

Multiplying 87078698281 by its sum of digits (64), we get a square (5573036689984 = 2360728²).

The spelling of 87078698281 in words is "eighty-seven billion, seventy-eight million, six hundred ninety-eight thousand, two hundred eighty-one".