1387497064 has 8 divisors (see below), whose sum is σ = 2601557010. Its totient is φ = 693748528.

The previous prime is 1387497061. The next prime is 1387497071. The reversal of 1387497064 is 4607947831.

It can be written as a sum of positive squares in only one way, i.e., 1249622500 + 137874564 = 35350^2 + 11742^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 1387496999 and 1387497017.

It is not an unprimeable number, because it can be changed into a prime (1387497061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86718559 + ... + 86718574.

Almost surely, 2^1387497064 is an apocalyptic number.

It is an amenable number.

1387497064 is a deficient number, since it is larger than the sum of its proper divisors (1214059946).

1387497064 is a wasteful number, since it uses less digits than its factorization.

1387497064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173437139 (or 173437135 counting only the distinct ones).

The product of its (nonzero) digits is 1016064, while the sum is 49.

The square root of 1387497064 is about 37249.1216540739. The cubic root of 1387497064 is about 1115.3487655306.

The spelling of 1387497064 in words is "one billion, three hundred eighty-seven million, four hundred ninety-seven thousand, sixty-four".