642621154 has 48 divisors (see below), whose sum is σ = 1190109888. Its totient is φ = 254759904.

The previous prime is 642621151. The next prime is 642621157. The reversal of 642621154 is 451126246.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (642621151) and next prime (642621157).

It is not an unprimeable number, because it can be changed into a prime (642621151) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 215844 + ... + 218800.

It is an arithmetic number, because the mean of its divisors is an integer number (24793956).

Almost surely, 2^642621154 is an apocalyptic number.

642621154 is a deficient number, since it is larger than the sum of its proper divisors (547488734).

642621154 is a wasteful number, since it uses less digits than its factorization.

642621154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3047 (or 3028 counting only the distinct ones).

The product of its digits is 11520, while the sum is 31.

The square root of 642621154 is about 25349.9734516626. The cubic root of 642621154 is about 862.9487537751.

The spelling of 642621154 in words is "six hundred forty-two million, six hundred twenty-one thousand, one hundred fifty-four".