70721700 has 216 divisors, whose sum is σ = 252921312. Its totient is φ = 15160320.

The previous prime is 70721687. The next prime is 70721719. The reversal of 70721700 is 712707.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 249759 + ... + 250041.

It is an arithmetic number, because the mean of its divisors is an integer number (1170932).

Almost surely, 2^70721700 is an apocalyptic number.

70721700 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 70721700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (126460656).

70721700 is an abundant number, since it is smaller than the sum of its proper divisors (182199612).

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

70721700 is a wasteful number, since it uses less digits than its factorization.

70721700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331 (or 317 counting only the distinct ones).

The product of its (nonzero) digits is 686, while the sum is 24.

The square root of 70721700 is about 8409.6194919865. The cubic root of 70721700 is about 413.5400385348.

The spelling of 70721700 in words is "seventy million, seven hundred twenty-one thousand, seven hundred".