72920861 has 8 divisors (see below), whose sum is σ = 78597120. Its totient is φ = 67254192.

The previous prime is 72920843. The next prime is 72920863. The reversal of 72920861 is 16802927.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 72920861 - 2¹⁰ = 72919837 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 (72920863) 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, 25460 + ... + 28178.

It is an arithmetic number, because the mean of its divisors is an integer number (9824640).

Almost surely, 2^72920861 is an apocalyptic number.

It is an amenable number.

72920861 is a deficient number, since it is larger than the sum of its proper divisors (5676259).

72920861 is a wasteful number, since it uses less digits than its factorization.

72920861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4795.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 72920861 is about 8539.3712297803. The cubic root of 72920861 is about 417.7828382145.

The spelling of 72920861 in words is "seventy-two million, nine hundred twenty thousand, eight hundred sixty-one".