99780454 has 4 divisors (see below), whose sum is σ = 149670684. Its totient is φ = 49890226.

The previous prime is 99780451. The next prime is 99780491. The reversal of 99780454 is 45408799.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 45408799 = 311 ⋅146009.

It is a super-2 number, since 2×99780454² = 19912278000892232, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99780451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24945112 + ... + 24945115.

It is an arithmetic number, because the mean of its divisors is an integer number (37417671).

Almost surely, 2^99780454 is an apocalyptic number.

99780454 is a deficient number, since it is larger than the sum of its proper divisors (49890230).

99780454 is a wasteful number, since it uses less digits than its factorization.

99780454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49890229.

The product of its (nonzero) digits is 362880, while the sum is 46.

The square root of 99780454 is about 9989.0166683213. The cubic root of 99780454 is about 463.8189537184.

The spelling of 99780454 in words is "ninety-nine million, seven hundred eighty thousand, four hundred fifty-four".