1620408970 has 16 divisors (see below), whose sum is σ = 2987876808. Its totient is φ = 632354560.

The previous prime is 1620408961. The next prime is 1620408991. The reversal of 1620408970 is 798040261.

It can be written as a sum of positive squares in 4 ways, for example, as 419717169 + 1200691801 = 20487^2 + 34651^2 .

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, 1975699 + ... + 1976518.

Almost surely, 2^1620408970 is an apocalyptic number.

1620408970 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1620408970 is a deficient number, since it is larger than the sum of its proper divisors (1367467838).

1620408970 is a wasteful number, since it uses less digits than its factorization.

1620408970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3952265.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 1620408970 is about 40254.3037450656. The cubic root of 1620408970 is about 1174.5591151104.

The spelling of 1620408970 in words is "one billion, six hundred twenty million, four hundred eight thousand, nine hundred seventy".