1662020400 has 60 divisors (see below), whose sum is σ = 5324009192. Its totient is φ = 443205120.

The previous prime is 1662020357. The next prime is 1662020401. The reversal of 1662020400 is 40202661.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (60).

It is not an unprimeable number, because it can be changed into a prime (1662020401) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 691309 + ... + 693708.

Almost surely, 2^1662020400 is an apocalyptic number.

1662020400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1662020400 is an abundant number, since it is smaller than the sum of its proper divisors (3661988792).

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

1662020400 is a wasteful number, since it uses less digits than its factorization.

1662020400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1385038 (or 1385027 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 1662020400 is about 40767.8844189884. The cubic root of 1662020400 is about 1184.5283244485.

The spelling of 1662020400 in words is "one billion, six hundred sixty-two million, twenty thousand, four hundred".