1620253760 has 56 divisors (see below), whose sum is σ = 3947989056. Its totient is φ = 633024000.

The previous prime is 1620253753. The next prime is 1620253801. The reversal of 1620253760 is 673520261.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45116 + ... + 72635.

Almost surely, 2^1620253760 is an apocalyptic number.

1620253760 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1620253760 is an abundant number, since it is smaller than the sum of its proper divisors (2327735296).

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

1620253760 is a wasteful number, since it uses less digits than its factorization.

1620253760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117811 (or 117801 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 32.

The square root of 1620253760 is about 40252.3758305022. The cubic root of 1620253760 is about 1174.5216124090.

The spelling of 1620253760 in words is "one billion, six hundred twenty million, two hundred fifty-three thousand, seven hundred sixty".