133643820 has 24 divisors (see below), whose sum is σ = 374202864. Its totient is φ = 35638336.

The previous prime is 133643789. The next prime is 133643827. The reversal of 133643820 is 28346331.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (133643827) 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, 1113639 + ... + 1113758.

It is an arithmetic number, because the mean of its divisors is an integer number (15591786).

Almost surely, 2^133643820 is an apocalyptic number.

133643820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

133643820 is an abundant number, since it is smaller than the sum of its proper divisors (240559044).

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

133643820 is a wasteful number, since it uses less digits than its factorization.

133643820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2227409 (or 2227407 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 30.

The square root of 133643820 is about 11560.4420330712. The cubic root of 133643820 is about 511.2691956215.

The spelling of 133643820 in words is "one hundred thirty-three million, six hundred forty-three thousand, eight hundred twenty".