642467746 has 8 divisors (see below), whose sum is σ = 994788864. Its totient is φ = 310871460.

The previous prime is 642467731. The next prime is 642467759. The reversal of 642467746 is 647764246.

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

It is a junction number, because it is equal to n+sod(n) for n = 642467696 and 642467705.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5181130 + ... + 5181253.

It is an arithmetic number, because the mean of its divisors is an integer number (124348608).

Almost surely, 2^642467746 is an apocalyptic number.

642467746 is a deficient number, since it is larger than the sum of its proper divisors (352321118).

642467746 is a wasteful number, since it uses less digits than its factorization.

642467746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10362416.

The product of its digits is 1354752, while the sum is 46.

The square root of 642467746 is about 25346.9474690741. The cubic root of 642467746 is about 862.8800799397.

It can be divided in two parts, 64246774 and 6, that added together give a triangular number (64246780 = T₁₁₃₃₅).

The spelling of 642467746 in words is "six hundred forty-two million, four hundred sixty-seven thousand, seven hundred forty-six".