72780454 has 4 divisors (see below), whose sum is σ = 109170684. Its totient is φ = 36390226.

The previous prime is 72780427. The next prime is 72780457. The reversal of 72780454 is 45408727.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×72780454² = 10593988968892232, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72780457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18195112 + ... + 18195115.

It is an arithmetic number, because the mean of its divisors is an integer number (27292671).

Almost surely, 2^72780454 is an apocalyptic number.

72780454 is a deficient number, since it is larger than the sum of its proper divisors (36390230).

72780454 is a wasteful number, since it uses less digits than its factorization.

72780454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36390229.

The product of its (nonzero) digits is 62720, while the sum is 37.

The square root of 72780454 is about 8531.1461129206. The cubic root of 72780454 is about 417.5145230226.

The spelling of 72780454 in words is "seventy-two million, seven hundred eighty thousand, four hundred fifty-four".