742686720 has 128 divisors (see below), whose sum is σ = 2378134080. Its totient is φ = 197918720.

The previous prime is 742686697. The next prime is 742686761. The reversal of 742686720 is 27686247.

It is a tau number, because it is divible by the number of its divisors (128).

It is a nialpdrome in base 8.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 490765 + ... + 492275.

Almost surely, 2^742686720 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 742686720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1189067040).

742686720 is an abundant number, since it is smaller than the sum of its proper divisors (1635447360).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

742686720 is an equidigital number, since it uses as much as digits as its factorization.

742686720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1549 (or 1521 counting only the distinct ones).

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

The square root of 742686720 is about 27252.2791707409. The cubic root of 742686720 is about 905.5975094306.

The spelling of 742686720 in words is "seven hundred forty-two million, six hundred eighty-six thousand, seven hundred twenty".