70721492 has 6 divisors (see below), whose sum is σ = 123762618. Its totient is φ = 35360744.

The previous prime is 70721491. The next prime is 70721507. The reversal of 70721492 is 29412707.

It can be written as a sum of positive squares in only one way, i.e., 68989636 + 1731856 = 8306^2 + 1316^2 .

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70721491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8840183 + ... + 8840190.

It is an arithmetic number, because the mean of its divisors is an integer number (20627103).

Almost surely, 2^70721492 is an apocalyptic number.

It is an amenable number.

70721492 is a deficient number, since it is larger than the sum of its proper divisors (53041126).

70721492 is a wasteful number, since it uses less digits than its factorization.

70721492 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17680377 (or 17680375 counting only the distinct ones).

The product of its (nonzero) digits is 7056, while the sum is 32.

The square root of 70721492 is about 8409.6071251872. The cubic root of 70721492 is about 413.5396331128.

The spelling of 70721492 in words is "seventy million, seven hundred twenty-one thousand, four hundred ninety-two".