87387705644 has 6 divisors (see below), whose sum is σ = 152928484884. Its totient is φ = 43693852820.

The previous prime is 87387705619. The next prime is 87387705661. The reversal of 87387705644 is 44650778378.

It is a super-2 number, since 2×87387705644² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10923463202 + ... + 10923463209.

It is an arithmetic number, because the mean of its divisors is an integer number (25488080814).

Almost surely, 2^87387705644 is an apocalyptic number.

It is an amenable number.

87387705644 is a deficient number, since it is larger than the sum of its proper divisors (65540779240).

87387705644 is a wasteful number, since it uses less digits than its factorization.

87387705644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21846926415 (or 21846926413 counting only the distinct ones).

The product of its (nonzero) digits is 31610880, while the sum is 59.

The spelling of 87387705644 in words is "eighty-seven billion, three hundred eighty-seven million, seven hundred five thousand, six hundred forty-four".