1620400662 has 48 divisors (see below), whose sum is σ = 3780438480. Its totient is φ = 499739136.

The previous prime is 1620400651. The next prime is 1620400673. The reversal of 1620400662 is 2660040261.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1620400651) and next prime (1620400673).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26823 + ... + 62930.

It is an arithmetic number, because the mean of its divisors is an integer number (78759135).

Almost surely, 2^1620400662 is an apocalyptic number.

1620400662 is an abundant number, since it is smaller than the sum of its proper divisors (2160037818).

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

1620400662 is a wasteful number, since it uses less digits than its factorization.

1620400662 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89837 (or 89834 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 1620400662 is about 40254.2005509984. The cubic root of 1620400662 is about 1174.5571077460.

The spelling of 1620400662 in words is "one billion, six hundred twenty million, four hundred thousand, six hundred sixty-two".