73780280 has 48 divisors (see below), whose sum is σ = 193113720. Its totient is φ = 25295424.

The previous prime is 73780253. The next prime is 73780313. The reversal of 73780280 is 8208737.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 73780280.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16862 + ... + 20781.

Almost surely, 2^73780280 is an apocalyptic number.

73780280 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

73780280 is an abundant number, since it is smaller than the sum of its proper divisors (119333440).

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

73780280 is a wasteful number, since it uses less digits than its factorization.

73780280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37668 (or 37657 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 35.

The square root of 73780280 is about 8589.5448074971. The cubic root of 73780280 is about 419.4177116064.

The spelling of 73780280 in words is "seventy-three million, seven hundred eighty thousand, two hundred eighty".