1228629870 has 384 divisors, whose sum is σ = 3962649600. Its totient is φ = 270978048.

The previous prime is 1228629869. The next prime is 1228629887. The reversal of 1228629870 is 789268221.

1228629870 is a `hidden beast` number, since 12 + 2 + 8 + 629 + 8 + 7 + 0 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 13804786 + ... + 13804874.

It is an arithmetic number, because the mean of its divisors is an integer number (10319400).

Almost surely, 2^1228629870 is an apocalyptic number.

1228629870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1228629870, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1981324800).

1228629870 is an abundant number, since it is smaller than the sum of its proper divisors (2734019730).

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

1228629870 is a wasteful number, since it uses less digits than its factorization.

1228629870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166 (or 154 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 45.

The square root of 1228629870 is about 35051.8169286558. The cubic root of 1228629870 is about 1071.0432861539.

The spelling of 1228629870 in words is "one billion, two hundred twenty-eight million, six hundred twenty-nine thousand, eight hundred seventy".