642178473 has 16 divisors (see below), whose sum is σ = 901849920. Its totient is φ = 405340416.

The previous prime is 642178429. The next prime is 642178483. The reversal of 642178473 is 374871246.

It is not a de Polignac number, because 642178473 - 2⁸ = 642178217 is a prime.

It is a super-2 number, since 2×642178473² = 824786382369223458, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (642178483) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 156261 + ... + 160317.

It is an arithmetic number, because the mean of its divisors is an integer number (56365620).

Almost surely, 2^642178473 is an apocalyptic number.

It is an amenable number.

642178473 is a deficient number, since it is larger than the sum of its proper divisors (259671447).

642178473 is a wasteful number, since it uses less digits than its factorization.

642178473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6856.

The product of its digits is 225792, while the sum is 42.

The square root of 642178473 is about 25341.2405576365. The cubic root of 642178473 is about 862.7505557301.

The spelling of 642178473 in words is "six hundred forty-two million, one hundred seventy-eight thousand, four hundred seventy-three".