721742402 has 8 divisors (see below), whose sum is σ = 1082890512. Its totient is φ = 360778900.

The previous prime is 721742381. The next prime is 721742407. The reversal of 721742402 is 204247127.

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

It is not an unprimeable number, because it can be changed into a prime (721742407) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35924 + ... + 52287.

It is an arithmetic number, because the mean of its divisors is an integer number (135361314).

Almost surely, 2^721742402 is an apocalyptic number.

721742402 is a deficient number, since it is larger than the sum of its proper divisors (361148110).

721742402 is a wasteful number, since it uses less digits than its factorization.

721742402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92304.

The product of its (nonzero) digits is 6272, while the sum is 29.

The square root of 721742402 is about 26865.2638550229. The cubic root of 721742402 is about 897.0033676686.

Adding to 721742402 its reverse (204247127), we get a palindrome (925989529).

The spelling of 721742402 in words is "seven hundred twenty-one million, seven hundred forty-two thousand, four hundred two".