245557620 has 216 divisors, whose sum is σ = 945610848. Its totient is φ = 51004800.

The previous prime is 245557579. The next prime is 245557621. The reversal of 245557620 is 26755542.

245557620 is a `hidden beast` number, since 2 + 45 + 557 + 62 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (245557621) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 95755 + ... + 98285.

It is an arithmetic number, because the mean of its divisors is an integer number (4377828).

Almost surely, 2^245557620 is an apocalyptic number.

245557620 is a gapful number since it is divisible by the number (20) 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 245557620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (472805424).

245557620 is an abundant number, since it is smaller than the sum of its proper divisors (700053228).

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

245557620 is a wasteful number, since it uses less digits than its factorization.

245557620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2571 (or 2559 counting only the distinct ones).

The product of its (nonzero) digits is 84000, while the sum is 36.

The square root of 245557620 is about 15670.2782362024. The cubic root of 245557620 is about 626.2068372370.

The spelling of 245557620 in words is "two hundred forty-five million, five hundred fifty-seven thousand, six hundred twenty".