87897781426 has 48 divisors (see below), whose sum is σ = 165289564440. Its totient is φ = 34747695360.

The previous prime is 87897781373. The next prime is 87897781429. The reversal of 87897781426 is 62418779878.

It can be written as a sum of positive squares in 4 ways, for example, as 35364683025 + 52533098401 = 188055^2 + 229201^2 .

It is a super-2 number, since 2×87897781426² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (87897781429) 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, 1796406 + ... + 1844686.

Almost surely, 2^87897781426 is an apocalyptic number.

87897781426 is a deficient number, since it is larger than the sum of its proper divisors (77391783014).

87897781426 is a wasteful number, since it uses less digits than its factorization.

87897781426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49739 (or 49732 counting only the distinct ones).

The product of its digits is 75866112, while the sum is 67.

The spelling of 87897781426 in words is "eighty-seven billion, eight hundred ninety-seven million, seven hundred eighty-one thousand, four hundred twenty-six".