1245164640 has 48 divisors (see below), whose sum is σ = 3922270128. Its totient is φ = 332043776.

The previous prime is 1245164623. The next prime is 1245164647. The reversal of 1245164640 is 464615421.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1245164647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1296567 + ... + 1297526.

It is an arithmetic number, because the mean of its divisors is an integer number (81713961).

Almost surely, 2^1245164640 is an apocalyptic number.

1245164640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1245164640 is an abundant number, since it is smaller than the sum of its proper divisors (2677105488).

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

1245164640 is a wasteful number, since it uses less digits than its factorization.

1245164640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2594111 (or 2594103 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 33.

The square root of 1245164640 is about 35286.8904835776. The cubic root of 1245164640 is about 1075.8265545023.

The spelling of 1245164640 in words is "one billion, two hundred forty-five million, one hundred sixty-four thousand, six hundred forty".