72921701 has 4 divisors (see below), whose sum is σ = 73030092. Its totient is φ = 72813312.

The previous prime is 72921691. The next prime is 72921713. The reversal of 72921701 is 10712927.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10712927 = 103 ⋅104009.

It can be written as a sum of positive squares in 2 ways, for example, as 71808676 + 1113025 = 8474^2 + 1055^2 .

It is a cyclic number.

It is not a de Polignac number, because 72921701 - 2¹⁰ = 72920677 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72921781) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53180 + ... + 54533.

It is an arithmetic number, because the mean of its divisors is an integer number (18257523).

Almost surely, 2^72921701 is an apocalyptic number.

It is an amenable number.

72921701 is a deficient number, since it is larger than the sum of its proper divisors (108391).

72921701 is a wasteful number, since it uses less digits than its factorization.

72921701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108390.

The product of its (nonzero) digits is 1764, while the sum is 29.

The square root of 72921701 is about 8539.4204135878. The cubic root of 72921701 is about 417.7844424021.

The spelling of 72921701 in words is "seventy-two million, nine hundred twenty-one thousand, seven hundred one".