100428157 has 4 divisors (see below), whose sum is σ = 100465920. Its totient is φ = 100390396.

The previous prime is 100428121. The next prime is 100428169. The reversal of 100428157 is 751824001.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100428157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100428187) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14563 + ... + 20320.

It is an arithmetic number, because the mean of its divisors is an integer number (25116480).

Almost surely, 2^100428157 is an apocalyptic number.

It is an amenable number.

100428157 is a deficient number, since it is larger than the sum of its proper divisors (37763).

100428157 is an equidigital number, since it uses as much as digits as its factorization.

100428157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37762.

The product of its (nonzero) digits is 2240, while the sum is 28.

The square root of 100428157 is about 10021.3849841227. The cubic root of 100428157 is about 464.8203830886.

It can be divided in two parts, 1004 and 28157, that added together give a triangular number (29161 = T₂₄₁).

The spelling of 100428157 in words is "one hundred million, four hundred twenty-eight thousand, one hundred fifty-seven".