1620653970 has 32 divisors (see below), whose sum is σ = 4188768192. Its totient is φ = 398930112.

The previous prime is 1620653939. The next prime is 1620653971. The reversal of 1620653970 is 793560261.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (1620653971) 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, 2077372 + ... + 2078151.

It is an arithmetic number, because the mean of its divisors is an integer number (130899006).

Almost surely, 2^1620653970 is an apocalyptic number.

1620653970 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1620653970 is an abundant number, since it is smaller than the sum of its proper divisors (2568114222).

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

1620653970 is a wasteful number, since it uses less digits than its factorization.

1620653970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4155546.

The product of its (nonzero) digits is 68040, while the sum is 39.

The square root of 1620653970 is about 40257.3467829165. The cubic root of 1620653970 is about 1174.6183084965.

The spelling of 1620653970 in words is "one billion, six hundred twenty million, six hundred fifty-three thousand, nine hundred seventy".