245147840 has 56 divisors (see below), whose sum is σ = 667158432. Its totient is φ = 84049920.

The previous prime is 245147831. The next prime is 245147873. The reversal of 245147840 is 48741542.

It is a tau number, because it is divible by the number of its divisors (56).

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 245147840.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52481 + ... + 56960.

Almost surely, 2^245147840 is an apocalyptic number.

245147840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

245147840 is an abundant number, since it is smaller than the sum of its proper divisors (422010592).

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

245147840 is a wasteful number, since it uses less digits than its factorization.

245147840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109465 (or 109455 counting only the distinct ones).

The product of its (nonzero) digits is 35840, while the sum is 35.

The square root of 245147840 is about 15657.1977058476. The cubic root of 245147840 is about 625.8583108777.

The spelling of 245147840 in words is "two hundred forty-five million, one hundred forty-seven thousand, eight hundred forty".