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30740815 = 57878309
BaseRepresentation
bin111010101000…
…1000101001111
32010211210110201
41311101011033
530332201230
63014514331
7522202240
oct165210517
963753421
1030740815
1116397036
12a3659a7
1364a4241
144122cc7
152a735ca
hex1d5114f

30740815 has 8 divisors (see below), whose sum is σ = 42158880. Its totient is φ = 21079392.

The previous prime is 30740813. The next prime is 30740819. The reversal of 30740815 is 51804703.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 30740815 - 21 = 30740813 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30740813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 439120 + ... + 439189.

It is an arithmetic number, because the mean of its divisors is an integer number (5269860).

Almost surely, 230740815 is an apocalyptic number.

30740815 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

30740815 is a deficient number, since it is larger than the sum of its proper divisors (11418065).

30740815 is an equidigital number, since it uses as much as digits as its factorization.

30740815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 878321.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 30740815 is about 5544.4400077916. The cubic root of 30740815 is about 313.2601314083.

The spelling of 30740815 in words is "thirty million, seven hundred forty thousand, eight hundred fifteen".

Divisors: 1 5 7 35 878309 4391545 6148163 30740815