245280690 has 128 divisors (see below), whose sum is σ = 695520000. Its totient is φ = 61337088.

The previous prime is 245280689. The next prime is 245280691. The reversal of 245280690 is 96082542.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (245280689) and next prime (245280691).

It is a super-2 number, since 2×245280690² = 120325233773752200, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (245280691) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 702636 + ... + 702984.

It is an arithmetic number, because the mean of its divisors is an integer number (5433750).

Almost surely, 2^245280690 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 245280690, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (347760000).

245280690 is an abundant number, since it is smaller than the sum of its proper divisors (450239310).

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

245280690 is a wasteful number, since it uses less digits than its factorization.

245280690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 521 (or 515 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 245280690 is about 15661.4395890033. The cubic root of 245280690 is about 625.9713450666.

The spelling of 245280690 in words is "two hundred forty-five million, two hundred eighty thousand, six hundred ninety".