742978643 has 8 divisors (see below), whose sum is σ = 836668416. Its totient is φ = 653646600.

The previous prime is 742978633. The next prime is 742978651. The reversal of 742978643 is 346879247.

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

It is a cyclic number.

It is not a de Polignac number, because 742978643 - 2²⁸ = 474543187 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 742978591 and 742978600.

It is not an unprimeable number, because it can be changed into a prime (742978633) 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, 1089071 + ... + 1089752.

It is an arithmetic number, because the mean of its divisors is an integer number (104583552).

Almost surely, 2^742978643 is an apocalyptic number.

742978643 is a deficient number, since it is larger than the sum of its proper divisors (93689773).

742978643 is a wasteful number, since it uses less digits than its factorization.

742978643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2178865.

The product of its digits is 2032128, while the sum is 50.

The square root of 742978643 is about 27257.6345818928. The cubic root of 742978643 is about 905.7161463133.

The spelling of 742978643 in words is "seven hundred forty-two million, nine hundred seventy-eight thousand, six hundred forty-three".