642762951 has 16 divisors (see below), whose sum is σ = 910890240. Its totient is φ = 402010560.

The previous prime is 642762943. The next prime is 642762977. The reversal of 642762951 is 159267246.

It is not a de Polignac number, because 642762951 - 2³ = 642762943 is a prime.

It is a super-2 number, since 2×642762951² = 826288422356456802, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642762451) 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, 48870 + ... + 60611.

It is an arithmetic number, because the mean of its divisors is an integer number (56930640).

Almost surely, 2^642762951 is an apocalyptic number.

642762951 is a deficient number, since it is larger than the sum of its proper divisors (268127289).

642762951 is a wasteful number, since it uses less digits than its factorization.

642762951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109606.

The product of its digits is 181440, while the sum is 42.

The square root of 642762951 is about 25352.7700853378. The cubic root of 642762951 is about 863.0122201709.

It can be divided in two parts, 6427 and 62951, that added together give a triangular number (69378 = T₃₇₂).

The spelling of 642762951 in words is "six hundred forty-two million, seven hundred sixty-two thousand, nine hundred fifty-one".