646788154 has 16 divisors (see below), whose sum is σ = 1060390656. Its totient is φ = 294552000.

The previous prime is 646788151. The next prime is 646788199. The reversal of 646788154 is 451887646.

It is a junction number, because it is equal to n+sod(n) for n = 646788098 and 646788107.

It is not an unprimeable number, because it can be changed into a prime (646788151) 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, 305772 + ... + 307879.

It is an arithmetic number, because the mean of its divisors is an integer number (66274416).

Almost surely, 2^646788154 is an apocalyptic number.

646788154 is a deficient number, since it is larger than the sum of its proper divisors (413602502).

646788154 is a wasteful number, since it uses less digits than its factorization.

646788154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 613701.

The product of its digits is 1290240, while the sum is 49.

The square root of 646788154 is about 25432.0300801961. The cubic root of 646788154 is about 864.8099659388.

The spelling of 646788154 in words is "six hundred forty-six million, seven hundred eighty-eight thousand, one hundred fifty-four".