247772240 has 40 divisors (see below), whose sum is σ = 585525768. Its totient is φ = 97482240.

The previous prime is 247772237. The next prime is 247772279. The reversal of 247772240 is 42277742.

It can be written as a sum of positive squares in 4 ways, for example, as 6031936 + 241740304 = 2456^2 + 15548^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×247772240² = 122782165829235200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 247772240.

It is a congruent number.

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, 20507 + ... + 30266.

Almost surely, 2^247772240 is an apocalyptic number.

247772240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

247772240 is an abundant number, since it is smaller than the sum of its proper divisors (337753528).

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

247772240 is a wasteful number, since it uses less digits than its factorization.

247772240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50847 (or 50841 counting only the distinct ones).

The product of its (nonzero) digits is 43904, while the sum is 35.

The square root of 247772240 is about 15740.7826997262. The cubic root of 247772240 is about 628.0837380055.

The spelling of 247772240 in words is "two hundred forty-seven million, seven hundred seventy-two thousand, two hundred forty".