1257240064 has 20 divisors (see below), whose sum is σ = 2512025604. Its totient is φ = 628619776.

The previous prime is 1257240037. The next prime is 1257240071. The reversal of 1257240064 is 4600427521.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1227262 + ... + 1228285.

Almost surely, 2^1257240064 is an apocalyptic number.

It is an amenable number.

1257240064 is a deficient number, since it is larger than the sum of its proper divisors (1254785540).

1257240064 is an frugal number, since it uses more digits than its factorization.

1257240064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2455565 (or 2455549 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 31.

The square root of 1257240064 is about 35457.5811921795. The cubic root of 1257240064 is about 1079.2931085218.

Adding to 1257240064 its reverse (4600427521), we get a palindrome (5857667585).

The spelling of 1257240064 in words is "one billion, two hundred fifty-seven million, two hundred forty thousand, sixty-four".