1620264747 has 8 divisors (see below), whose sum is σ = 2287432656. Its totient is φ = 1016636672.

The previous prime is 1620264731. The next prime is 1620264769. The reversal of 1620264747 is 7474620261.

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

It is a cyclic number.

It is not a de Polignac number, because 1620264747 - 2⁴ = 1620264731 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1620264047) 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, 15884898 + ... + 15884999.

It is an arithmetic number, because the mean of its divisors is an integer number (285929082).

Almost surely, 2^1620264747 is an apocalyptic number.

1620264747 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

1620264747 is a deficient number, since it is larger than the sum of its proper divisors (667167909).

1620264747 is a wasteful number, since it uses less digits than its factorization.

1620264747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31769917.

The product of its (nonzero) digits is 112896, while the sum is 39.

The square root of 1620264747 is about 40252.5123066871. The cubic root of 1620264747 is about 1174.5242672277.

The spelling of 1620264747 in words is "one billion, six hundred twenty million, two hundred sixty-four thousand, seven hundred forty-seven".