247385780 has 18 divisors (see below), whose sum is σ = 519657894. Its totient is φ = 98926176.

The previous prime is 247385779. The next prime is 247385783. The reversal of 247385780 is 87583742.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 152868496 + 94517284 = 12364^2 + 9722^2 .

It is a super-2 number, since 2×247385780² = 122399448292416800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (247385783) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 68582 + ... + 72098.

It is an arithmetic number, because the mean of its divisors is an integer number (28869883).

Almost surely, 2^247385780 is an apocalyptic number.

247385780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

247385780 is an abundant number, since it is smaller than the sum of its proper divisors (272272114).

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

247385780 is an frugal number, since it uses more digits than its factorization.

247385780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7043 (or 3524 counting only the distinct ones).

The product of its (nonzero) digits is 376320, while the sum is 44.

The square root of 247385780 is about 15728.5021537335. The cubic root of 247385780 is about 627.7570192026.

The spelling of 247385780 in words is "two hundred forty-seven million, three hundred eighty-five thousand, seven hundred eighty".