247778028 has 60 divisors (see below), whose sum is σ = 652000272. Its totient is φ = 82049760.

The previous prime is 247777979. The next prime is 247778029. The reversal of 247778028 is 820877742.

It is a super-2 number, since 2×247778028² = 122787902319137568, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (247778029) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 48433 + ... + 53303.

Almost surely, 2^247778028 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 247778028, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (326000136).

247778028 is an abundant number, since it is smaller than the sum of its proper divisors (404222244).

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

247778028 is a wasteful number, since it uses less digits than its factorization.

247778028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5044 (or 5033 counting only the distinct ones).

The product of its (nonzero) digits is 351232, while the sum is 45.

The square root of 247778028 is about 15740.9665522801. The cubic root of 247778028 is about 628.0886286803.

The spelling of 247778028 in words is "two hundred forty-seven million, seven hundred seventy-eight thousand, twenty-eight".