245667780 has 36 divisors (see below), whose sum is σ = 745192812. Its totient is φ = 65511360.

The previous prime is 245667769. The next prime is 245667781. The reversal of 245667780 is 87766542.

245667780 is a `hidden beast` number, since 2 + 4 + 566 + 7 + 7 + 80 = 666.

245667780 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 172975104 + 72692676 = 13152^2 + 8526^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (245667781) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 682231 + ... + 682590.

Almost surely, 2^245667780 is an apocalyptic number.

245667780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

245667780 is an abundant number, since it is smaller than the sum of its proper divisors (499525032).

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

245667780 is a wasteful number, since it uses less digits than its factorization.

245667780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1364836 (or 1364831 counting only the distinct ones).

The product of its (nonzero) digits is 564480, while the sum is 45.

The square root of 245667780 is about 15673.7927764788. The cubic root of 245667780 is about 626.3004644574.

The spelling of 245667780 in words is "two hundred forty-five million, six hundred sixty-seven thousand, seven hundred eighty".