73977940 has 24 divisors (see below), whose sum is σ = 159144552. Its totient is φ = 28869120.

The previous prime is 73977919. The next prime is 73977947. The reversal of 73977940 is 4977937.

It can be written as a sum of positive squares in 4 ways, for example, as 4955076 + 69022864 = 2226^2 + 8308^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73977947) 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, 44289 + ... + 45928.

It is an arithmetic number, because the mean of its divisors is an integer number (6631023).

Almost surely, 2^73977940 is an apocalyptic number.

It is an amenable number.

73977940 is an abundant number, since it is smaller than the sum of its proper divisors (85166612).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

73977940 is a wasteful number, since it uses less digits than its factorization.

73977940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90267 (or 90265 counting only the distinct ones).

The product of its (nonzero) digits is 333396, while the sum is 46.

The square root of 73977940 is about 8601.0429600136. The cubic root of 73977940 is about 419.7919226300.

The spelling of 73977940 in words is "seventy-three million, nine hundred seventy-seven thousand, nine hundred forty".