70721534 has 32 divisors (see below), whose sum is σ = 120960000. Its totient is φ = 30741984.

The previous prime is 70721531. The next prime is 70721593. The reversal of 70721534 is 43512707.

It is a junction number, because it is equal to n+sod(n) for n = 70721497 and 70721506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70721531) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 117767 + ... + 118365.

It is an arithmetic number, because the mean of its divisors is an integer number (3780000).

Almost surely, 2^70721534 is an apocalyptic number.

70721534 is a deficient number, since it is larger than the sum of its proper divisors (50238466).

70721534 is a wasteful number, since it uses less digits than its factorization.

70721534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 872.

The product of its (nonzero) digits is 5880, while the sum is 29.

The square root of 70721534 is about 8409.6096223309. The cubic root of 70721534 is about 413.5397149769.

The spelling of 70721534 in words is "seventy million, seven hundred twenty-one thousand, five hundred thirty-four".