722312640 has 336 divisors, whose sum is σ = 2946757632. Its totient is φ = 164975616.

The previous prime is 722312603. The next prime is 722312653. The reversal of 722312640 is 46213227.

722312640 is a `hidden beast` number, since 7 + 2 + 2 + 3 + 12 + 640 = 666.

It is a tau number, because it is divible by the number of its divisors (336).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 543657 + ... + 544983.

It is an arithmetic number, because the mean of its divisors is an integer number (8770112).

Almost surely, 2^722312640 is an apocalyptic number.

722312640 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 722312640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1473378816).

722312640 is an abundant number, since it is smaller than the sum of its proper divisors (2224444992).

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

722312640 is a wasteful number, since it uses less digits than its factorization.

722312640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1366 (or 1344 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 722312640 is about 26875.8746834405. The cubic root of 722312640 is about 897.2395418462.

Adding to 722312640 its reverse (46213227), we get a palindrome (768525867).

The spelling of 722312640 in words is "seven hundred twenty-two million, three hundred twelve thousand, six hundred forty".