72774157 has 4 divisors (see below), whose sum is σ = 73094976. Its totient is φ = 72453340.

The previous prime is 72774131. The next prime is 72774167. The reversal of 72774157 is 75147727.

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 not a de Polignac number, because 72774157 - 2¹⁹ = 72249869 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 (72774167) 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, 160069 + ... + 160522.

It is an arithmetic number, because the mean of its divisors is an integer number (18273744).

Almost surely, 2^72774157 is an apocalyptic number.

It is an amenable number.

72774157 is a deficient number, since it is larger than the sum of its proper divisors (320819).

72774157 is a wasteful number, since it uses less digits than its factorization.

72774157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320818.

The product of its digits is 96040, while the sum is 40.

The square root of 72774157 is about 8530.7770454983. Note that the first 3 decimals coincide. The cubic root of 72774157 is about 417.5024814893.

The spelling of 72774157 in words is "seventy-two million, seven hundred seventy-four thousand, one hundred fifty-seven".