1620446040 has 64 divisors (see below), whose sum is σ = 5401490400. Its totient is φ = 432118656.

The previous prime is 1620445997. The next prime is 1620446041. The reversal of 1620446040 is 406440261.

1620446040 is a `hidden beast` number, since 16 + 2 + 0 + 44 + 604 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 1620445995 and 1620446013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620446041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 749127 + ... + 751286.

Almost surely, 2^1620446040 is an apocalyptic number.

1620446040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1620446040 is an abundant number, since it is smaller than the sum of its proper divisors (3781044360).

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

1620446040 is a wasteful number, since it uses less digits than its factorization.

1620446040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1500433 (or 1500423 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The square root of 1620446040 is about 40254.7641900931. The cubic root of 1620446040 is about 1174.5680718152.

The spelling of 1620446040 in words is "one billion, six hundred twenty million, four hundred forty-six thousand, forty".