70721623 has 8 divisors (see below), whose sum is σ = 81182592. Its totient is φ = 60350136.

The previous prime is 70721617. The next prime is 70721639. The reversal of 70721623 is 32612707.

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

It is not a de Polignac number, because 70721623 - 2¹⁷ = 70590551 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 70721591 and 70721600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70721603) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20665 + ... + 23842.

It is an arithmetic number, because the mean of its divisors is an integer number (10147824).

Almost surely, 2^70721623 is an apocalyptic number.

70721623 is a deficient number, since it is larger than the sum of its proper divisors (10460969).

70721623 is a wasteful number, since it uses less digits than its factorization.

70721623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44741.

The product of its (nonzero) digits is 3528, while the sum is 28.

The square root of 70721623 is about 8409.6149138947. The cubic root of 70721623 is about 413.5398884508.

The spelling of 70721623 in words is "seventy million, seven hundred twenty-one thousand, six hundred twenty-three".