1270238640 has 480 divisors, whose sum is σ = 4787693568. Its totient is φ = 277094400.

The previous prime is 1270238621. The next prime is 1270238647. The reversal of 1270238640 is 468320721.

1270238640 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×1270238640² = 3227012405098099200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (1270238647) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 15304039 + ... + 15304121.

Almost surely, 2^1270238640 is an apocalyptic number.

1270238640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1270238640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2393846784).

1270238640 is an abundant number, since it is smaller than the sum of its proper divisors (3517454928).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1270238640 is a wasteful number, since it uses less digits than its factorization.

1270238640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169 (or 152 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 33.

The square root of 1270238640 is about 35640.4074050789. The cubic root of 1270238640 is about 1082.9999582228. Note that the first 4 decimals are identical.

The spelling of 1270238640 in words is "one billion, two hundred seventy million, two hundred thirty-eight thousand, six hundred forty".