247890820 has 24 divisors (see below), whose sum is σ = 527905728. Its totient is φ = 97759200.

The previous prime is 247890817. The next prime is 247890823. The reversal of 247890820 is 28098742.

It is an interprime number because it is at equal distance from previous prime (247890817) and next prime (247890823).

It is a super-2 number, since 2×247890820² = 122899717280544800, which contains 22 as substring.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (247890823) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 85866 + ... + 88705.

It is an arithmetic number, because the mean of its divisors is an integer number (21996072).

Almost surely, 2^247890820 is an apocalyptic number.

247890820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

247890820 is an abundant number, since it is smaller than the sum of its proper divisors (280014908).

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

247890820 is a wasteful number, since it uses less digits than its factorization.

247890820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174651 (or 174649 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 40.

The square root of 247890820 is about 15744.5488979520. The cubic root of 247890820 is about 628.1839191120.

The spelling of 247890820 in words is "two hundred forty-seven million, eight hundred ninety thousand, eight hundred twenty".