72978477 has 32 divisors (see below), whose sum is σ = 116067840. Its totient is φ = 40201920.

The previous prime is 72978473. The next prime is 72978527. The reversal of 72978477 is 77487927.

It is not a de Polignac number, because 72978477 - 2² = 72978473 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72978473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 27474 + ... + 30012.

It is an arithmetic number, because the mean of its divisors is an integer number (3627120).

Almost surely, 2^72978477 is an apocalyptic number.

It is an amenable number.

72978477 is a deficient number, since it is larger than the sum of its proper divisors (43089363).

72978477 is a wasteful number, since it uses less digits than its factorization.

72978477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2633.

The product of its digits is 1382976, while the sum is 51.

The square root of 72978477 is about 8542.7441141591. The cubic root of 72978477 is about 417.8928416658.

The spelling of 72978477 in words is "seventy-two million, nine hundred seventy-eight thousand, four hundred seventy-seven".