1620742387 has 8 divisors (see below), whose sum is σ = 1770955632. Its totient is φ = 1471008000.

The previous prime is 1620742327. The next prime is 1620742393. The reversal of 1620742387 is 7832470261.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1620742387 - 2²³ = 1612353779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1620742327) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 112614 + ... + 126187.

It is an arithmetic number, because the mean of its divisors is an integer number (221369454).

Almost surely, 2^1620742387 is an apocalyptic number.

1620742387 is a deficient number, since it is larger than the sum of its proper divisors (150213245).

1620742387 is a wasteful number, since it uses less digits than its factorization.

1620742387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239429.

The product of its (nonzero) digits is 112896, while the sum is 40.

The square root of 1620742387 is about 40258.4449153218. Note that the first 3 decimals coincide. The cubic root of 1620742387 is about 1174.6396690790.

It can be divided in two parts, 162074 and 2387, that added together give a palindrome (164461).

The spelling of 1620742387 in words is "one billion, six hundred twenty million, seven hundred forty-two thousand, three hundred eighty-seven".